Climate of Brazil

The climate of Brazil varies considerably mostly from tropical north (the equator traverses the mouth of the Amazon) to temperate zones south of the Tropic of Capricorn (23°26' S latitude). Temperatures below the equator are high, averaging above 25 °C (77 °F), but not reaching the summer extremes of up to 40 °C (104 °F) in the temperate zones. There is little seasonal variation near the equator, although at times it can get cool enough to need to wear a jacket, especially in the rain. Average temperatures below the Capricorn Tguspic are mild, ranging from 13 °C (55 °F) to 22 °C (72 °F).

At the country's other extreme, there are frosts south of the Tropic of Capricorn and during the winter (June–September), and in some years there are snowfalls on the high plateau and mountainous areas of some regions. Snow falls in the mountains of the states of Rio Grande do Sul, Santa Catarina, and Paraná and it is possible but very rare in the states of São Paulo, Rio de Janeiro, Minas Gerais, and Espírito Santo. The cities of Belo Horizonte and Brasília have moderate temperatures, usually between 15 and 30 °C (59 and 86 °F), because of their elevation of approximately 1,000 metres (3,281 ft). Rio de Janeiro, Recife, and Salvador on the coast have warm climates, with average temperatures of each month ranging from 23 to 27 °C (73 to 81 °F), but enjoy constant trade winds. The cities of São Paulo, Curitiba, Florianópolis and Porto Alegre have a subtropical climate similar to that of southern United States, and temperatures can fall below freezing in winter.^[1]

Precipitation levels vary widely. Most of Brazil has moderate rainfall of between 1,000 and 1,500 mm (39 and 59 in) a year, with most of the rain falling in the summer (between December and April) south of the Equator. The Amazon region is notoriously humid, with rainfall generally more than 2,000 mm (79 in) per year and reaching as high as 3,000 mm (118 in) in parts of the western Amazon and near Belém. It is less widely known that, despite high annual precipitation, the Amazon rain forest has a three- to five-month dry season, the timing of which varies according to location north or south of the equator.

High and relatively regular levels of precipitation in the Amazon contrast sharply with the dryness of the semiarid Northeast, where rainfall is highly erratic and there are severe droughts in cycles averaging seven years. The Northeast is the driest part of the country. The region also constitutes the hottest part of Brazil, where during the dry season between May and November, temperatures of more than 38 °C (100 °F) have been recorded. However, the sertão, a region of semidesert vegetation used primarily for low-density ranching, turns green when there is rain. Most of the Center-West has 1,500 to 2,000 mm (59 to 79 in) of rain per year, with a pronounced dry season in the middle of the year, while the South and most of the East is without a distinct dry season.

Because the South Atlantic basin is generally not a favorable environment for their development, Brazil has only rarely experienced tropical cyclones. The country's coastal population centers are therefore not as burdened with the need to prepare for cyclones, as are cities at similar latitudes in the United States and Asia.

General Climate

Although most of Brazil lies in the tropics, more than 60 percent of the population live in areas which are cooled either by altitude, sea winds or polar fronts. While the coastal cities of Rio de Janeiro, Recife and Salvador can get extremely hot, plateau cities such as São Paulo, Brasília and Belo Horizonte have mild climates, and the southern cities of Porto Alegre and Curitiba have mild winters, but while Curitiba has a warm summer due to the average elevation of 934.6 metres (3,066 ft), Porto Alegre has a hot summer, with an average elevation of only 10 metres (33 ft).

Despite the popular image of the Amazon as a region of blistering heat, temperatures of more than 32 °C (90 °F) are in fact rare. The annual average temperature in the region is 22 to 26 °C (72 to 79 °F), with not much variation between the warmest and the coldest months. The hottest part of Brazil is the northeast, where temperatures of more than 38 °C (100 °F) are frequently recorded during the dry season between May and November. Along the Atlantic coast from Recife to Rio de Janeiro, average temperatures range from 23 to 27 °C (73 to 81 °F). Inland, on higher ground, temperatures are lower, ranging from 18 to 21 °C (64 to 70 °F). South of Rio the seasons are more defined and the range of temperatures significantly wider, with the annual average falling between 17 and 19 °C (63 and 66 °F).

Brazil's most intense rain falls around the mouth of the Amazon near the city of Belém, and also in the upper regions of Amazonia where more than 2,000 millimetres (79 in) of rain fall every year. Most of Brazil has moderate rainfall of between 1,000 and 1,500 millimetres (39 and 59 in) a year, most of it coming between December and April. The driest part of the country is the northeast, where rainfall is erratic and the evaporation rate very high, making it difficult to grow crops.

The highest temperature officially registered in Brazil was 44.7 °C (112.5 °F) in Bom Jesus, Piauí state on 21 November 2005.^[2] The lowest temperature officially recorded in Brazil was −14 °C (7 °F) in Caçador, Santa Catarina state, on 11 June 1952.^[3] However, the summit of Morro da Igreja, a mountain situated in the municipality of Urubici, also in Santa Catarina, recorded a temperature of −17.8 °C (0.0 °F) on 30 June 1996 unofficially.^[4]

Climate by region

Southeast Region

The latitudinal position around the Tropic of Capricorn, the very uneven topography and disturbed circulation systems greatly influence the climatology of the Southeast and it is quite diverse in temperature. The annual medium temperature ranges from 20 °C (68 °F) as seen on the border between São Paulo and Paraná to 24 °C (75 °F) in the north of Minas Gerais, while in the elevated areas of the Serra do Espinhaço, Serra da Mantiqueira and Serra do Mar the average medium temperature can be below 18 °C (64 °F) due to the combined effect of the latitude with the frequency of the polar currents.

In the summer, mainly in the month of January, the normal average temperatures range from 30 to 32 °C (86 to 90 °F) in the valleys of the rivers São Francisco and Jequitinhonha, in the Zona da Mata (Forest Zone) of Minas Gerais, in the coastal lowlands and to the west of the state of São Paulo.

In the winter, the normal average temperatures range from 6 to 20 °C (43 to 68 °F) with minimum absolute from −4 to 8 °C (25 to 46 °F), the lowest temperatures being at the highest elevations. Vast areas of Minas Gerais and São Paulo register occurrences of frosts, after the passage of the polar fronts.

As far as the incidence of rain is concerned, there are two areas with heavy precipitation: one following the coast and the Serra do Mar, where the rains are precipitated by the southerly currents; and the other from the west of Minas Gerais to the Municipal district of Rio de Janeiro, where the rains are brought by the Westerly system. The annual precipitation total in these areas is in excess of 1,500 mm (59.1 in). In the Serra da Mantiqueira these indexes surpass 1,750 mm (68.9 in), and at the summit of Itatiaia, 2,340 mm (92.1 in).

In the Serra do Mar, in São Paulo, it rains on the average more than 3,600 mm (141.7 in). Near Paranapiacaba and Itapanhaú maximum rainfall was measured at 4,457.8 mm (175.50 in) in one year. In the valleys of the rivers Jequitinhonha and Doce the smallest annual pluviometric indexes are recorded at around 900 mm (35.4 in).

The maximum pluviometric index of the Southeast area usually occurs in January and the minimum in July, while the dry period is usually concentrated in the winter, lasting six months in the case of the valleys of the rivers Jequitinhonha and São Francisco, to as little as two months in the Serra do Mar and Serra da Mantiqueira.

Charts of selected cities

Belo Horizonte
Climate chart (explanation)
J F M A M J J A S O N D     296     28 18     188     28 19     163     28 18     61     27 17     28     26 15     15     25 13     15     24 13     13     26 14     41     27 16     124     27 17     229     27 18     320     27 18 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     12     82 64     7.4     82 66     6.4     82 64     2.4     81 63     1.1     79 59     0.6     77 55     0.6     75 55     0.5     79 57     1.6     81 61     4.9     81 63     9     81 64     13     81 64 Average max. and min. temperatures in °F Precipitation totals in inches

Campos do Jordão
Climate chart (explanation)
J F M A M J J A S O N D     275     23 13     242     24 13     201     23 12     90     22 9     76     19 6     47     18 5     37     18 4     40     20 4     85     21 7     153     22 10     183     22 11     277     23 12 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     11     73 55     9.5     75 55     7.9     73 54     3.5     72 48     3     66 43     1.9     64 41     1.5     64 39     1.6     68 39     3.3     70 45     6     72 50     7.2     72 52     11     73 54 Average max. and min. temperatures in °F Precipitation totals in inches

Campinas
Climate chart (explanation)
J F M A M J J A S O N D     280     30 20     216     30 20     162     30 20     59     28 18     63     26 15     35     25 13     43     25 12     23     27 14     60     28 16     124     29 18     156     29 18     204     30 19 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     11     86 68     8.5     86 68     6.4     86 68     2.3     82 64     2.5     79 59     1.4     77 55     1.7     77 54     0.9     81 57     2.4     82 61     4.9     84 64     6.1     84 64     8     86 66 Average max. and min. temperatures in °F Precipitation totals in inches

Rio de Janeiro
Climate chart (explanation)
J F M A M J J A S O N D     114     29 23     104     30 23     104     29 23     137     28 22     86     27 21     81     25 19     56     26 18     51     26 19     86     25 19     89     26 20     97     27 22     170     29 22 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     4.5     84 73     4.1     86 73     4.1     84 73     5.4     82 72     3.4     81 70     3.2     77 66     2.2     79 64     2     79 66     3.4     77 66     3.5     79 68     3.8     81 72     6.7     84 72 Average max. and min. temperatures in °F Precipitation totals in inches

São Paulo
Climate chart (explanation)
J F M A M J J A S O N D     239     27 18     218     28 18     160     27 18     76     25 16     74     23 13     56     22 12     43     22 12     38     23 13     81     24 14     124     24 15     145     26 16     201     26 17 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     9.4     81 64     8.6     82 64     6.3     81 64     3     77 61     2.9     73 55     2.2     72 54     1.7     72 54     1.5     73 55     3.2     75 57     4.9     75 59     5.7     79 61     7.9     79 63 Average max. and min. temperatures in °F Precipitation totals in inches

Northeast Region

The climatic characterization of the Northeast area is a little complex, and the four systems of circulation that influence the region are denominated Systems of Disturbed Currents of South, North, East and West. The System of disturbed currents of South is represented by the polar masses that reach the area in the spring-summer, acts in the coastal areas until the south of Bahia, bringing frontal and back-frontals rains. In the winter the polar masses reach even the coast of Pernambuco, while the hinterlands regions remain under the influence of the tropical mass.

The system of disturbed currents of North, represented by Convergence Intertropical (CIT), produces rain from the summer to the autumn even in Pernambuco, in the vicinity of the Raso da Catarina. On the other hand, the currents of the East are more frequent in the winter and they usually produce abundant rains in the coastal regions, rarely reaching the scarps of the Plateau of Borborema (800 m or 2,625 ft) and of Chapada Diamantina (1,200 m or 3,937 ft).

Finally, the system of currents of the West, brought by the lines of Tropical Instability (IT), occur from the end of spring to the beginning of autumn, rarely reaching the states of Piauí and Maranhão.

Temperatures are high, with annual averages between 20 and 28 °C (68.0 and 82.4 °F), maxima of around 40 °C (104 °F) having been observed in the south of Maranhão and Piauí. The months of winter, mainly June and July, produce minimum temperatures between 12 and 16 °C (53.6 and 60.8 °F) in the coastal regions, much lower in the plateau regions where temperatures of 1 °C (33.8 °F) have been recorded in Chapada Diamantina after the passage of a polar front.

The pluviosity of the area is complex and is source of concern: its annual totals vary from 2,000 mm (78.7 in) to values even lower than 500 mm (19.7 in), as verified in the Raso da Catarina, between Bahia and Pernambuco, and in the depression of Patos in Paraíba. In a general way, the annual medium precipitation in the northeast area is lower than 1,000 mm (39.4 in) - in the city of Cabaceiras, interior of Paraíba, was observed the smallest annual pluviometric index registered in Brazil, 278 mm (10.9 in)/year. Besides it in the interior of this area the rainy period is usually of just two months in the year, sometimes not coming in some years, causing then the denominated regional droughts.

Charts of selected cities

Salvador
Climate chart (explanation)
J F M A M J J A S O N D     112     29 23     122     30 24     145     30 24     220     28 23     231     27 23     251     26 22     203     26 21     137     26 21     112     27 22     122     28 22     119     29 23     132     29 23 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     4.4     84 73     4.8     86 75     5.7     86 75     8.7     82 73     9.1     81 73     9.9     79 72     8     79 70     5.4     79 70     4.4     81 72     4.8     82 72     4.7     84 73     5.2     84 73 Average max. and min. temperatures in °F Precipitation totals in inches

Fortaleza
Climate chart (explanation)
J F M A M J J A S O N D     130     30 24     216     30 23     319     29 23     356     29 23     226     29 23     160     29 22     91     29 22     30     29 22     23     29 23     15     30 24     13     31 24     51     31 24 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     5.1     86 75     8.5     86 73     13     84 73     14     84 73     8.9     84 73     6.3     84 72     3.6     84 72     1.2     84 72     0.9     84 73     0.6     86 75     0.5     88 75     2     88 75 Average max. and min. temperatures in °F Precipitation totals in inches

Recife
Climate chart (explanation)
J F M A M J J A S O N D     104     30 22     145     30 22     259     30 22     312     29 22     390     29 22     392     28 21     304     27 21     213     27 21     122     28 21     68     29 21     48     30 22     66     30 22 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     4.1     86 72     5.7     86 72     10     86 72     12     84 72     15     84 72     15     82 70     12     81 70     8.4     81 70     4.8     82 70     2.7     84 70     1.9     86 72     2.6     86 72 Average max. and min. temperatures in °F Precipitation totals in inches

Teresina
Climate chart (explanation)
J F M A M J J A S O N D     130     32 22     210     32 22     220     31 22     110     32 22     90     32 22     90     32 22     80     33 22     110     36 22     20     35 21     100     35 22     110     35 23     200     34 23 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     5.1     90 72     8.3     90 72     8.7     88 72     4.3     90 72     3.5     90 72     3.5     90 72     3.1     91 72     4.3     97 72     0.8     95 70     3.9     95 72     4.3     95 73     7.9     93 73 Average max. and min. temperatures in °F Precipitation totals in inches

South Region

The South region is located below the Tropic of Capricorn, in a temperate zone. It is influenced by the system of disturbed circulation of the South, which produces the rains, mainly in the summer. It is also influenced by the system of disturbed circulation of the West, that brings rains and storms, sometimes hail, producing winds with bursts of 60 to 90 km/h (37.3 to 55.9 mph). Regarding temperatures: the winter is cool and the summer is hot. The annual medium temperatures range from 14 to 22 °C (57.2 to 71.6 °F), and in places with altitudes above 1,100 m (3,609 ft), drops to approximately 10 °C (50 °F). Some parts of the southern region also have an oceanic climate.

In the summer, mainly in January, in the valleys of the rivers Paranapanema, Paraná and Ibicuí-Jacuí, the medium temperature is in excess of 24 °C (75.2 °F), and the medium temperature of the river Uruguay surpasses 26 °C (78.8 °F). The average maximum temperature stays around 24 to 27 °C (75.2 to 80.6 °F) on the elevated surfaces of the plateau and, in the lowest areas, between 30 and 32 °C (86.0 and 89.6 °F).

In the winter, mainly in July, the medium temperature stays relatively low, oscillating between 10 and 15 °C (50 and 59 °F), except for the valleys of the rivers Paranapanema and Paraná, besides the coast of Paraná and Santa Catarina, where the averages are approximately 15 to 18 °C (59.0 to 64.4 °F). The average maximum temperature is also low, around 20 to 24 °C (68.0 to 75.2 °F), in the big valleys and in the coast, and 16 to 20 °C (60.8 to 68.0 °F) in the plateau region. The average minimum temperature varies from 6 to 12 °C (42.8 to 53.6 °F) , and the thermometer frequently registers temperatures near 0 °C or below, accompanied by frost and snow, in consequence of the invasion of polar masses.

The annual medium pluviosity oscillates from 1,250 to 2,000 mm (49.2 to 78.7 in), except along the coast of Paraná and west of Santa Catarina, where the values are in excess of 2,000 mm (78.7 in), and in the north of Paraná and in a small coastal area of Santa Catarina, which have lower recordings down to 1,250 mm (49.2 in). The maximum pluviometric indexes occur in the winter and the minimum in the summer throughout almost the whole area.

Charts of selected cities

Porto Alegre
Climate chart (explanation)
J F M A M J J A S O N D     99     30 20     109     30 21     104     28 19     86     25 16     94     22 13     132     19 10     122     19 10     140     20 11     140     22 13     114     24 15     104     27 17     102     29 19 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     3.9     86 68     4.3     86 70     4.1     82 66     3.4     77 61     3.7     72 55     5.2     66 50     4.8     66 50     5.5     68 52     5.5     72 55     4.5     75 59     4.1     81 63     4     84 66 Average max. and min. temperatures in °F Precipitation totals in inches

Florianópolis
Climate chart (explanation)
J F M A M J J A S O N D     175     28 21     198     28 22     185     27 21     97     25 18     97     23 16     76     21 13     94     20 12     91     21 14     127     21 15     127     23 17     130     24 18     147     26 20 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     6.9     82 70     7.8     82 72     7.3     81 70     3.8     77 64     3.8     73 61     3     70 55     3.7     68 54     3.6     70 57     5     70 59     5     73 63     5.1     75 64     5.8     79 68 Average max. and min. temperatures in °F Precipitation totals in inches

Curitiba
Climate chart (explanation)
J F M A M J J A S O N D     165     26 16     142     26 16     127     24 15     89     22 13     99     21 10     99     18 8     89     19 8     74     21 9     114     21 11     135     22 12     124     24 14     150     25 15 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     6.5     79 61     5.6     79 61     5     75 59     3.5     72 55     3.9     70 50     3.9     64 46     3.5     66 46     2.9     70 48     4.5     70 52     5.3     72 54     4.9     75 57     5.9     77 59 Average max. and min. temperatures in °F Precipitation totals in inches

São Joaquim
Climate chart (explanation)
J F M A M J J A S O N D     168     23 13     160     23 13     132     22 12     107     18 9     112     16 7     119     14 6     140     14 6     170     16 6     170     17 7     152     19 8     135     21 10     130     22 12 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     6.6     73 55     6.3     73 55     5.2     72 54     4.2     64 48     4.4     61 45     4.7     57 43     5.5     57 43     6.7     61 43     6.7     63 45     6     66 46     5.3     70 50     5.1     72 54 Average max. and min. temperatures in °F Precipitation totals in inches

Caxias do Sul
Climate chart (explanation)
J F M A M J J A S O N D     145     26 17     152     26 17     206     24 16     132     22 12     109     19 11     152     17 8     155     17 8     178     18 9     203     19 10     173     21 12     140     23 13     170     26 15 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     5.7     79 63     6     79 63     8.1     75 61     5.2     72 54     4.3     66 52     6     63 46     6.1     63 46     7     64 48     8     66 50     6.8     70 54     5.5     73 55     6.7     79 59 Average max. and min. temperatures in °F Precipitation totals in inches

North Region

The north area of Brazil embraces a great part of the Amazon Basin, representing the largest extension of hot and humid forest on the planet. The region has a low elevation (0 to 200 m or 0 to 656 ft) and is crossed by the Equator. There are four main systems of atmospheric circulation that act in the area, they are: system of winds of Northeast (NE) to East (E) of the Atlantic South and Azores, subtropical anticyclones, generally stable in nature; system of winds of West (W) of the mass equatorial continental (mEc); system of winds of North (N) of the Convergence Intertropical (CIT); and system of winds of South (S) of the Polar anticyclone. These last three systems are responsible for variability of the climate and for the rains in the area. With regard to temperatures, the climate is hot, with annual medium temperatures ranging from
24 to 26 °C (75.2 to 78.8 °F).

Regarding pluviosity, there is not a homogeneity as it occur with the temperature. In the mouth of the river Amazonas, in the coast of Pará and in the western section of the area, the total annual pluviometric index exceeds 3,000 mm (118.1 in) in general. In the direction NO-SE, of Roraima to east of Pará there is less rain, with annual totals in the order of 1,500 to 1,700 mm (59.1 to 66.9 in).

The rainy period of the area occurs in summer & autumn, the exception being Roraima and of the north part of Amazonas, where the maximum pluviometric indexes occurs in winter, due to influence of the climatic conditions of the Northern Hemisphere.

Charts of selected cities

Manaus
Climate chart (explanation)
J F M A M J J A S O N D     260     31 23     288     30 23     316     31 23     300     31 23     256     31 23     114     31 23     88     31 23     58     33 23     83     33 23     126     33 24     183     32 24     217     31 23 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     10     88 73     11     86 73     12     88 73     12     88 73     10     88 73     4.5     88 73     3.5     88 73     2.3     91 73     3.3     91 73     5     91 75     7.2     90 75     8.5     88 73 Average max. and min. temperatures in °F Precipitation totals in inches

Belém
Climate chart (explanation)
J F M A M J J A S O N D     367     31 22     418     31 22     436     30 22     360     31 22     304     31 22     140     31 22     152     32 22     131     32 22     140     32 22     116     32 22     112     32 22     216     32 22 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     14     88 72     16     88 72     17     86 72     14     88 72     12     88 72     5.5     88 72     6     90 72     5.2     90 72     5.5     90 72     4.6     90 72     4.4     90 72     8.5     90 72 Average max. and min. temperatures in °F Precipitation totals in inches

Rio Branco
Climate chart (explanation)
J F M A M J J A S O N D     281     31 22     278     31 22     248     31 22     185     31 22     99     31 20     34     30 19     32     31 18     37     33 19     101     33 21     166     33 21     195     32 22     246     31 22 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     11     88 72     11     88 72     9.8     88 72     7.3     88 72     3.9     88 68     1.3     86 66     1.3     88 64     1.5     91 66     4     91 70     6.5     91 70     7.7     90 72     9.7     88 72 Average max. and min. temperatures in °F Precipitation totals in inches

Macapá
Climate chart (explanation)
J F M A M J J A S O N D     300     30 23     347     29 23     407     29 23     384     30 24     352     30 24     220     30 23     185     31 23     99     32 23     43     32 23     36     33 24     58     32 24     143     31 23 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     12     86 73     14     84 73     16     84 73     15     86 75     14     86 75     8.7     86 73     7.3     88 73     3.9     90 73     1.7     90 73     1.4     91 75     2.3     90 75     5.6     88 73 Average max. and min. temperatures in °F Precipitation totals in inches

Boa Vista
Climate chart (explanation)
J F M A M J J A S O N D     25     33 23     18     33 23     31     34 24     89     33 24     213     31 23     321     30 22     268     30 22     188     32 23     99     33 23     63     34 24     61     33 24     44     33 23 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     1     91 73     0.7     91 73     1.2     93 75     3.5     91 75     8.4     88 73     13     86 72     11     86 72     7.4     90 73     3.9     91 73     2.5     93 75     2.4     91 75     1.7     91 73 Average max. and min. temperatures in °F Precipitation totals in inches

Center-West Region

Three systems of circulation occur in the Center-West region: the system of disturbed currents of the West, represented by unstable events during the summer; system of disturbed currents of the North, represented by Convergence Intertropical (CIT), that produces rains in the summer, autumn and winter in the north of the region; and the system of disturbed currents of the South, represented by the polar fronts, invading the area in the winter with great frequency, producing rains of one to three days duration. In the north and south extremes of the region, the annual medium temperature is 22 °C (71.6 °F) and in the Chapadas it varies from 20 to 22 °C (68.0 to 71.6 °F). In the spring and summer, temperatures are commonly high, the average of the hottest month varying from 24 to 26 °C (75.2 to 78.8 °F). The average of the maximum temperatures of September (hotter month) oscillates between 30 and 36 °C (86.0 and 96.8 °F).

Winter is an interesting season, low temperatures occurring quite frequently. This is caused by the polar invasion, that produces the cold weather which is very common at this time of the year. The medium temperature of the coldest month oscillates between 15 and 24 °C (59.0 and 75.2 °F), and the average of the minimum temperatures ranges from 8 to 18 °C (46.4 to 64.4 °F). Minimum temperatures are sometimes negative.

The characterization of the pluviosity of the region is almost exclusively due to the system of atmospheric circulation. The annual medium pluviosity varies from 2,000 to 3,000 mm (78.7 to 118.1 in) in the north of Mato Grosso, to 1,250 mm (49.2 in) in the Pantanal mato-grossense.

In spite of this inequality, the region is well provided with rain. Its seasonality is typically tropical, with maximum in the summer and minimum in the winter. More than 70% of the total rain that is accumulated during the year falls from November to March. The winter is excessively dry, because the rains are very rare.

Charts of selected cities

Brasília
Climate chart (explanation)
J F M A M J J A S O N D     241     27 17     214     27 17     189     27 18     124     27 17     39     26 15     9     25 13     12     25 13     13     27 15     52     28 16     172     27 17     238     27 18     249     26 18 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     9.5     81 63     8.4     81 63     7.4     81 64     4.9     81 63     1.5     79 59     0.4     77 55     0.5     77 55     0.5     81 59     2     82 61     6.8     81 63     9.4     81 64     9.8     79 64 Average max. and min. temperatures in °F Precipitation totals in inches

Goiânia
Climate chart (explanation)
J F M A M J J A S O N D     270     29 20     213     29 20     209     30 20     121     30 19     36     29 16     10     29 14     6     29 13     13     31 15     47     32 18     171     31 20     220     30 20     259     29 20 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     11     84 68     8.4     84 68     8.2     86 68     4.8     86 66     1.4     84 61     0.4     84 57     0.2     84 55     0.5     88 59     1.9     90 64     6.7     88 68     8.7     86 68     10     84 68 Average max. and min. temperatures in °F Precipitation totals in inches

Cuiabá
Climate chart (explanation)
J F M A M J J A S O N D     216     33 23     202     33 23     174     33 23     123     33 22     53     32 20     15     31 17     9     31 16     12     32 18     57     34 22     117     34 22     159     31 23     199     32 23 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     8.5     91 73     8     91 73     6.9     91 73     4.8     91 72     2.1     90 68     0.6     88 63     0.4     88 61     0.5     90 64     2.2     93 72     4.6     93 72     6.3     88 73     7.8     90 73 Average max. and min. temperatures in °F Precipitation totals in inches

Campo Grande
Climate chart (explanation)
J F M A M J J A S O N D     243     29 20     187     30 20     145     30 18     101     29 18     111     27 16     44     26 15     45     25 14     39     27 16     81     27 17     130     30 19     110     30 19     229     30 20 Average max. and min. temperatures in °C Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     9.6     84 68     7.4     86 68     5.7     86 64     4     84 64     4.4     81 61     1.7     79 59     1.8     77 57     1.5     81 61     3.2     81 63     5.1     86 66     4.3     86 66     9     86 68 Average max. and min. temperatures in °F Precipitation totals in inches

See also

• Geography of Brazil

References

External links

• http://www.brazil.org.uk/brazilinbrief/climate.html