Altos climate — normals and trends

Q: What is the climate of Altos?

Altos has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 28.0 °C and it receives 1,556 mm of precipitation per year.

Q: What is the hottest day ever recorded in Altos?

The hottest day measured in Altos between 1940 and 2025 was 20 November 2005, reaching 41.0 °C.

Q: What is the coldest day in Altos?

The coldest day measured in Altos between 1940 and 2025 was 7 July 1959, at 19.3 °C.

Q: Does it snow in Altos?

Almost never: Altos sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Altos warmed?

Yes: Altos warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Altos?

The wettest day measured in Altos between 1940 and 2025 was 17 January 1979, with 222 mm of rain in 24 hours.

Q: What was the windiest day in Altos?

The windiest day measured in Altos between 1940 and 2025 was 16 August 1991, with winds reaching 27.2 km/h.

Q: What is the warmest month in Altos?

The warmest month in Altos is October (30.5 °C on average); the coldest is March (25.8 °C).

Q: How much does it rain in Altos?

Altos receives on average 1,556 mm of precipitation per year, spread over about 135 rainy days.

Q: Is it sunny in Altos?

Altos gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.

Altos (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 28.0 °C and it receives 1,556 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is October (30.5 °C on average) and the coldest is March (25.8 °C). Rainfall peaks in March.

Altos averages 0 frost days, 311 hot days (≥ 30 °C) and 135 rainy days per year.

Altos has warmed by +0.8 °C between 1940 and 2025, or +0.10 °C per decade. This trend is statistically significant.

The hottest day of the period reached 41.0 °C (on 20 November 2005) and the coldest 19.3 °C (on 7 July 1959).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

AltosPiauí

coords: -5.04°, -42.46°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthOctoberColdest monthMarchWettest monthMarchDriest monthAugust

Mean daily temperature

28.0°C

Average daily high

33.2°C

Average daily low

23.6°C

Annual rainfall

1,556mm

Sunshine / day

10.9h

Mean relative humidity

66%

Average peak wind

12.6km/h

Seasonal range

4.7°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

311 d/yr

Rainy days (≥ 1 mm)

135 d/yr

Annual snowfall

0.0 cm

Average feels-like high

36.9 °C

Average feels-like low

26.7 °C

Average peak gust

33.1 km/h

Tropical nights (≥ 20 °C)

364 d/yr

Solar radiation

20.3 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.8 °C

since 1940

+0.1 °C per decade · r² = 0.14 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

41.0 °C

20 November 2005

Coldest day

19.3 °C

7 July 1959

Wettest day

222 mm

17 January 1979

Windiest day

27.2 km/h

16 August 1991

Strongest gust

61.9 km/h

4 October 1958

Hottest feels-like

45.0 °C

28 October 2018

Coldest feels-like

18.5 °C

28 July 1975

Sunniest day

12.2 h

14 November 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	39.4 °C14 October 2025	21.5 °C19 January 2025	28.7 °C	865 mm	349
2024	38.8 °C26 October 2024	19.3 °C1 September 2024	28.2 °C	1,311 mm	355
2023	39.5 °C28 October 2023	20.5 °C17 January 2023	28.0 °C	1,310 mm	334
2022	37.8 °C6 October 2022	19.9 °C26 July 2022	27.4 °C	1,367 mm	339
2021	38.0 °C5 September 2021	20.8 °C29 June 2021	28.1 °C	1,206 mm	342
2020	38.8 °C21 October 2020	20.3 °C27 July 2020	28.0 °C	1,575 mm	342
2019	39.1 °C28 October 2019	22.2 °C15 January 2019	28.6 °C	1,384 mm	346
2018	39.3 °C18 September 2018	21.7 °C25 June 2018	28.3 °C	1,770 mm	326
2017	39.8 °C5 December 2017	21.9 °C19 July 2017	28.9 °C	1,483 mm	345
2016	40.5 °C25 November 2016	20.7 °C23 July 2016	29.4 °C	1,249 mm	351
2015	39.9 °C2 December 2015	22.0 °C22 February 2015	29.2 °C	1,012 mm	343
2014	38.9 °C12 October 2014	21.4 °C1 August 2014	28.6 °C	1,211 mm	348
2013	39.1 °C4 October 2013	21.9 °C8 June 2013	29.1 °C	1,308 mm	353
2012	40.7 °C24 October 2012	21.7 °C17 February 2012	29.6 °C	973 mm	355
2011	39.4 °C25 September 2011	21.4 °C9 August 2011	28.3 °C	1,622 mm	332
2010	40.2 °C4 October 2010	21.6 °C22 June 2010	29.1 °C	1,140 mm	352
2009	39.1 °C30 November 2009	21.0 °C25 July 2009	28.0 °C	2,542 mm	318
2008	39.2 °C27 October 2008	21.0 °C23 June 2008	28.4 °C	1,616 mm	324
2007	39.2 °C6 November 2007	21.9 °C22 February 2007	28.9 °C	1,264 mm	347
2006	38.9 °C8 December 2006	21.2 °C2 June 2006	28.4 °C	1,970 mm	335
2005	41.0 °C20 November 2005	21.6 °C25 July 2005	28.7 °C	1,359 mm	346
2004	39.5 °C14 November 2004	21.1 °C9 June 2004	28.2 °C	1,544 mm	331
2003	38.5 °C23 October 2003	20.2 °C11 July 2003	28.1 °C	1,535 mm	336
2002	39.1 °C23 October 2002	21.2 °C30 January 2002	28.2 °C	1,440 mm	334
2001	38.6 °C22 October 2001	20.7 °C9 June 2001	27.7 °C	1,378 mm	318
2000	38.2 °C29 November 2000	20.7 °C14 February 2000	27.6 °C	1,523 mm	320
1999	38.0 °C23 October 1999	20.1 °C11 July 1999	27.4 °C	2,146 mm	313
1998	39.5 °C7 October 1998	21.1 °C25 June 1998	28.7 °C	1,284 mm	340
1997	38.9 °C1 October 1997	20.2 °C12 June 1997	27.8 °C	1,419 mm	326
1996	38.7 °C4 November 1996	20.3 °C28 January 1996	27.8 °C	2,179 mm	311
1995	38.2 °C13 October 1995	20.3 °C14 August 1995	27.4 °C	2,327 mm	310
1994	38.2 °C21 November 1994	21.2 °C8 June 1994	27.8 °C	1,883 mm	315
1993	38.7 °C17 September 1993	21.3 °C18 February 1993	28.6 °C	1,279 mm	344
1992	39.2 °C6 January 1992	21.0 °C22 July 1992	28.8 °C	1,135 mm	340
1991	38.4 °C22 November 1991	21.3 °C22 July 1991	28.0 °C	1,502 mm	330
1990	38.0 °C12 October 1990	21.4 °C5 March 1990	28.2 °C	878 mm	343
1989	38.3 °C29 October 1989	21.0 °C30 July 1989	27.4 °C	2,033 mm	293
1988	38.7 °C26 November 1988	21.1 °C2 August 1988	27.7 °C	1,957 mm	318
1987	39.8 °C28 November 1987	21.5 °C9 March 1987	28.7 °C	1,391 mm	338
1986	38.7 °C18 December 1986	20.3 °C16 June 1986	27.3 °C	2,078 mm	297
1985	38.6 °C22 October 1985	19.5 °C25 June 1985	26.8 °C	3,584 mm	261
1984	39.6 °C13 December 1984	20.8 °C13 January 1984	27.6 °C	2,097 mm	304
1983	38.8 °C16 January 1983	20.8 °C30 July 1983	29.1 °C	866 mm	345
1982	38.8 °C17 November 1982	20.7 °C19 February 1982	28.0 °C	1,324 mm	320
1981	39.0 °C26 October 1981	21.0 °C15 February 1981	28.5 °C	1,078 mm	335
1980	38.2 °C11 October 1980	21.1 °C26 February 1980	27.8 °C	1,854 mm	323
1979	38.3 °C10 October 1979	20.9 °C21 July 1979	27.3 °C	2,411 mm	323
1978	37.3 °C2 October 1978	20.4 °C7 June 1978	27.4 °C	1,798 mm	324
1977	38.7 °C22 November 1977	20.1 °C14 July 1977	27.3 °C	2,135 mm	303
1976	37.1 °C23 September 1976	20.6 °C29 January 1976	27.2 °C	1,549 mm	316
1975	37.1 °C14 October 1975	19.7 °C11 June 1975	26.7 °C	2,000 mm	278
1974	36.4 °C25 October 1974	19.4 °C12 June 1974	26.3 °C	2,734 mm	243
1973	37.6 °C15 November 1973	19.3 °C20 January 1973	27.1 °C	2,492 mm	303
1972	38.2 °C16 November 1972	20.9 °C12 May 1972	27.5 °C	1,678 mm	317
1971	37.1 °C11 October 1971	20.4 °C24 June 1971	26.8 °C	2,032 mm	280
1970	37.2 °C3 October 1970	20.9 °C30 May 1970	27.7 °C	1,129 mm	331
1969	37.1 °C14 October 1969	20.8 °C17 August 1969	27.7 °C	1,175 mm	332
1968	37.0 °C31 October 1968	20.3 °C25 May 1968	26.7 °C	1,621 mm	252
1967	36.6 °C23 October 1967	20.7 °C10 March 1967	26.8 °C	2,281 mm	278
1966	38.4 °C1 October 1966	20.7 °C17 April 1966	27.6 °C	1,538 mm	269
1965	39.0 °C15 November 1965	20.7 °C6 July 1965	28.0 °C	1,091 mm	292
1964	39.0 °C9 November 1964	20.5 °C3 June 1964	27.3 °C	1,697 mm	235
1963	39.7 °C17 October 1963	20.5 °C17 January 1963	27.7 °C	1,587 mm	246
1962	39.0 °C20 October 1962	20.7 °C20 June 1962	27.6 °C	1,154 mm	269
1961	39.3 °C24 November 1961	19.7 °C8 February 1961	27.7 °C	1,787 mm	254
1960	39.5 °C8 December 1960	20.8 °C10 May 1960	28.1 °C	1,655 mm	286
1959	39.1 °C1 December 1959	19.3 °C7 July 1959	27.8 °C	1,608 mm	252
1958	39.6 °C14 October 1958	21.7 °C4 March 1958	29.1 °C	793 mm	347
1957	39.0 °C5 November 1957	19.9 °C7 June 1957	28.0 °C	1,750 mm	269
1956	38.6 °C28 October 1956	20.3 °C25 May 1956	27.8 °C	1,331 mm	282
1955	38.8 °C8 October 1955	21.0 °C25 January 1955	27.8 °C	1,429 mm	272
1954	38.7 °C4 November 1954	21.3 °C12 March 1954	27.7 °C	1,266 mm	297
1953	39.2 °C3 November 1953	21.2 °C28 May 1953	28.0 °C	1,030 mm	298
1952	38.8 °C29 October 1952	20.1 °C15 June 1952	27.6 °C	1,650 mm	275
1951	38.8 °C29 September 1951	21.1 °C12 January 1951	28.3 °C	902 mm	323
1950	38.9 °C8 November 1950	20.7 °C30 March 1950	28.1 °C	1,515 mm	274
1949	39.3 °C10 October 1949	20.5 °C15 February 1949	27.7 °C	1,725 mm	261
1948	39.0 °C10 November 1948	20.8 °C22 January 1948	28.0 °C	1,241 mm	287
1947	38.8 °C10 October 1947	21.1 °C18 May 1947	27.3 °C	1,938 mm	272
1946	39.0 °C12 December 1946	21.0 °C10 March 1946	28.4 °C	964 mm	324
1945	39.1 °C10 November 1945	19.6 °C15 June 1945	27.5 °C	1,135 mm	271
1944	39.1 °C4 November 1944	20.8 °C13 February 1944	27.7 °C	2,002 mm	256
1943	39.3 °C24 October 1943	19.5 °C5 May 1943	27.2 °C	1,417 mm	267
1942	39.6 °C21 November 1942	21.0 °C9 March 1942	28.9 °C	772 mm	343
1941	39.8 °C23 October 1941	21.7 °C21 March 1941	29.0 °C	965 mm	340
1940	38.5 °C12 December 1940	20.7 °C11 February 1940	27.5 °C	1,605 mm	260

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

34.2 °C

+1.0 °C

Hot days (≥ 30 °C)

349 d/yr

+38

Frost days (< 0 °C)

0 d/yr

Annual rainfall

865 mm

-691 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.0 °C	+0.3 °C	284 mm	+34 mm
Feb	31.7 °C	+0.8 °C	164 mm	-138 mm
Mar	31.0 °C	+0.6 °C	241 mm	-149 mm
Apr	32.0 °C	+1.5 °C	83 mm	-221 mm
May	33.3 °C	+2.1 °C	9 mm	-114 mm
Jun	33.3 °C	+1.0 °C	2 mm	-21 mm
Jul	34.6 °C	+1.2 °C	0 mm	-9 mm
Aug	35.8 °C	+1.0 °C	2 mm	-1 mm
Sep	37.3 °C	+1.2 °C	0 mm	-4 mm
Oct	37.4 °C	+0.8 °C	22 mm	+7 mm
Nov	36.8 °C	+1.0 °C	10 mm	-23 mm
Dec	34.5 °C	+0.3 °C	49 mm	-53 mm

The year's extremes

Hottest day

39.4 °C

14 Oct 2025

Coldest day

21.5 °C

19 Jan 2025

Wettest day

35.7 mm

14 Jan 2025

Windiest day

21.9 km/h

2 Sep 2025

Strongest gust

50.4 km/h

14 Jun 2025

Hottest feels-like

42.3 °C

20 Oct 2025

Coldest feels-like

20.5 °C

27 Jul 2025

Sunniest day

12.1 h

16 Nov 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Altos?

Altos has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 28.0 °C and it receives 1,556 mm of precipitation per year.

What is the hottest day ever recorded in Altos?

The hottest day measured in Altos between 1940 and 2025 was 20 November 2005, reaching 41.0 °C.

What is the coldest day in Altos?

The coldest day measured in Altos between 1940 and 2025 was 7 July 1959, at 19.3 °C.

Does it snow in Altos?

Almost never: Altos sees virtually no snow, with about 0 frost days per year.

Has the climate of Altos warmed?

Yes: Altos warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Altos?

The wettest day measured in Altos between 1940 and 2025 was 17 January 1979, with 222 mm of rain in 24 hours.

What was the windiest day in Altos?

The windiest day measured in Altos between 1940 and 2025 was 16 August 1991, with winds reaching 27.2 km/h.

What is the warmest month in Altos?

The warmest month in Altos is October (30.5 °C on average); the coldest is March (25.8 °C).

How much does it rain in Altos?

Altos receives on average 1,556 mm of precipitation per year, spread over about 135 rainy days.

Is it sunny in Altos?

Altos gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.

Are there tropical nights in Altos?

Yes: Altos has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Altos?

In Altos, between 1940 and 2025, the highest apparent temperature reached 45.0 °C on 28 October 2018, and the lowest was 18.5 °C on 28 July 1975.

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