Rio Claro climate — normals and trends

Q: What is the climate of Rio Claro?

Rio Claro has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.8 °C and it receives 1,679 mm of precipitation per year.

Q: What is the hottest day ever recorded in Rio Claro?

The hottest day measured in Rio Claro between 1940 and 2025 was 28 September 1961, reaching 37.5 °C.

Q: What is the coldest day in Rio Claro?

The coldest day measured in Rio Claro between 1940 and 2025 was 16 August 1978, at 6.2 °C.

Q: Does it snow in Rio Claro?

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

Q: Has the climate of Rio Claro warmed?

Yes: Rio Claro warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Rio Claro?

The wettest day measured in Rio Claro between 1940 and 2025 was 11 March 1954, with 155 mm of rain in 24 hours.

Q: What was the windiest day in Rio Claro?

The windiest day measured in Rio Claro between 1940 and 2025 was 22 September 2025, with winds reaching 21.9 km/h.

Q: What is the warmest month in Rio Claro?

The warmest month in Rio Claro is February (23.7 °C on average); the coldest is July (17.6 °C).

Q: How much does it rain in Rio Claro?

Rio Claro receives on average 1,679 mm of precipitation per year, spread over about 196 rainy days.

Q: Is it sunny in Rio Claro?

Rio Claro gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.

Rio Claro (Brazil) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 20.8 °C and it receives 1,679 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 February (23.7 °C on average) and the coldest is July (17.6 °C). Rainfall peaks in January.

Rio Claro averages 0 frost days, 40 hot days (≥ 30 °C) and 196 rainy days per year.

Rio Claro has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.5 °C (on 28 September 1961) and the coldest 6.2 °C (on 16 August 1978).

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

Rio ClaroRio de Janeiro

coords: -22.72°, -44.14°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthFebruaryColdest monthJulyWettest monthJanuaryDriest monthJune

Mean daily temperature

20.8°C

Average daily high

25.3°C

Average daily low

17.3°C

Annual rainfall

1,679mm

Sunshine / day

9.1h

Mean relative humidity

81%

Average peak wind

8.5km/h

Seasonal range

6.1°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

40 d/yr

Rainy days (≥ 1 mm)

196 d/yr

Annual snowfall

0.0 cm

Average feels-like high

28.2 °C

Average feels-like low

18.8 °C

Average peak gust

26.1 km/h

Tropical nights (≥ 20 °C)

78 d/yr

Solar radiation

16.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °C

since 1940

+0.2 °C per decade · r² = 0.58 · 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

37.5 °C

28 September 1961

Coldest day

6.2 °C

16 August 1978

Wettest day

155 mm

11 March 1954

Windiest day

21.9 km/h

22 September 2025

Strongest gust

69.8 km/h

22 October 1983

Hottest feels-like

42.8 °C

17 February 1994

Coldest feels-like

3.7 °C

16 August 1978

Sunniest day

13.4 h

21 December 1971

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	35.3 °C17 February 2025	9.9 °C17 July 2025	21.2 °C	1,116 mm	66
2024	35.1 °C2 October 2024	8.3 °C13 August 2024	21.9 °C	1,418 mm	82
2023	37.3 °C18 November 2023	9.9 °C4 July 2023	21.7 °C	1,366 mm	74
2022	33.6 °C10 September 2022	9.1 °C18 May 2022	20.7 °C	1,801 mm	50
2021	34.8 °C14 September 2021	7.6 °C1 July 2021	20.7 °C	1,381 mm	38
2020	36.4 °C2 October 2020	8.5 °C27 May 2020	21.1 °C	1,668 mm	46
2019	35.1 °C12 September 2019	9.0 °C12 July 2019	22.0 °C	1,536 mm	74
2018	34.3 °C18 January 2018	9.8 °C22 May 2018	21.7 °C	1,510 mm	53
2017	33.8 °C19 October 2017	10.7 °C26 August 2017	21.6 °C	1,321 mm	71
2016	34.1 °C31 January 2016	8.8 °C13 June 2016	21.5 °C	1,486 mm	79
2015	36.0 °C24 September 2015	11.9 °C27 June 2015	22.3 °C	1,363 mm	87
2014	34.9 °C3 January 2014	9.6 °C8 August 2014	21.8 °C	1,020 mm	80
2013	35.1 °C12 November 2013	9.4 °C26 July 2013	21.0 °C	1,858 mm	56
2012	36.1 °C19 September 2012	9.9 °C29 September 2012	21.4 °C	1,321 mm	60
2011	33.6 °C28 January 2011	8.8 °C6 June 2011	20.8 °C	1,521 mm	51
2010	35.2 °C8 February 2010	9.1 °C19 August 2010	21.4 °C	1,616 mm	82
2009	33.7 °C19 November 2009	9.1 °C4 June 2009	21.5 °C	1,911 mm	56
2008	33.1 °C26 October 2008	8.7 °C15 July 2008	20.8 °C	1,873 mm	45
2007	34.3 °C30 December 2007	7.9 °C30 July 2007	21.5 °C	1,328 mm	63
2006	35.4 °C25 January 2006	11.1 °C6 September 2006	21.3 °C	1,445 mm	48
2005	36.1 °C14 October 2005	10.1 °C10 July 2005	21.5 °C	1,892 mm	44
2004	33.7 °C31 October 2004	10.2 °C24 July 2004	20.9 °C	1,640 mm	39
2003	35.5 °C16 December 2003	11.2 °C19 August 2003	21.5 °C	1,600 mm	59
2002	34.4 °C1 December 2002	10.5 °C3 September 2002	22.0 °C	1,494 mm	73
2001	32.5 °C8 January 2001	11.1 °C29 July 2001	21.4 °C	1,456 mm	52
2000	33.7 °C12 October 2000	7.8 °C17 July 2000	20.8 °C	1,512 mm	46
1999	34.0 °C2 February 1999	9.1 °C16 August 1999	20.4 °C	1,661 mm	30
1998	35.3 °C31 January 1998	9.1 °C10 June 1998	21.3 °C	1,679 mm	54
1997	34.9 °C9 September 1997	8.7 °C9 June 1997	21.4 °C	1,448 mm	68
1996	34.1 °C27 January 1996	8.4 °C3 August 1996	20.7 °C	2,022 mm	62
1995	35.6 °C17 January 1995	10.0 °C7 June 1995	21.4 °C	1,865 mm	71
1994	34.4 °C17 February 1994	6.9 °C10 July 1994	21.6 °C	1,738 mm	73
1993	35.1 °C17 November 1993	9.7 °C23 June 1993	21.5 °C	1,590 mm	70
1992	33.8 °C22 February 1992	10.4 °C27 July 1992	21.2 °C	1,568 mm	42
1991	32.6 °C26 November 1991	10.4 °C17 August 1991	21.1 °C	1,605 mm	29
1990	32.7 °C15 November 1990	7.7 °C19 May 1990	21.2 °C	1,609 mm	42
1989	32.4 °C22 February 1989	8.7 °C22 July 1989	20.7 °C	1,648 mm	18
1988	33.6 °C27 September 1988	7.0 °C6 June 1988	20.9 °C	1,835 mm	41
1987	33.2 °C9 January 1987	8.5 °C26 June 1987	21.3 °C	1,469 mm	57
1986	33.3 °C7 October 1986	9.4 °C13 July 1986	21.3 °C	1,785 mm	42
1985	32.5 °C20 February 1985	7.1 °C9 June 1985	20.7 °C	1,660 mm	27
1984	33.8 °C13 January 1984	9.4 °C27 August 1984	21.4 °C	1,427 mm	42
1983	33.0 °C17 February 1983	9.0 °C7 August 1983	21.0 °C	2,259 mm	30
1982	32.9 °C3 November 1982	10.1 °C6 May 1982	20.8 °C	1,796 mm	20
1981	33.8 °C20 September 1981	8.9 °C22 July 1981	20.7 °C	1,783 mm	26
1980	33.6 °C27 October 1980	9.4 °C27 September 1980	21.1 °C	1,643 mm	35
1979	32.3 °C25 October 1979	6.8 °C31 May 1979	20.4 °C	1,827 mm	28
1978	34.0 °C31 January 1978	6.2 °C16 August 1978	20.8 °C	1,502 mm	36
1977	33.9 °C28 February 1977	11.4 °C21 May 1977	21.5 °C	1,550 mm	43
1976	33.3 °C25 January 1976	9.7 °C16 August 1976	20.5 °C	2,033 mm	19
1975	32.7 °C9 December 1975	7.2 °C8 July 1975	20.5 °C	1,860 mm	28
1974	33.3 °C26 September 1974	9.3 °C16 June 1974	20.7 °C	1,645 mm	28
1973	34.8 °C11 February 1973	8.3 °C22 June 1973	21.2 °C	1,738 mm	43
1972	33.6 °C27 October 1972	8.5 °C23 June 1972	21.0 °C	1,612 mm	33
1971	33.1 °C25 January 1971	9.0 °C20 July 1971	20.6 °C	1,493 mm	44
1970	32.8 °C9 December 1970	9.8 °C14 August 1970	20.6 °C	1,266 mm	25
1969	33.2 °C9 January 1969	10.6 °C27 July 1969	20.7 °C	1,576 mm	34
1968	33.7 °C15 December 1968	9.2 °C14 July 1968	19.7 °C	1,237 mm	24
1967	31.9 °C4 March 1967	9.3 °C20 July 1967	20.9 °C	1,956 mm	22
1966	32.5 °C22 January 1966	9.6 °C18 September 1966	20.3 °C	2,047 mm	33
1965	32.4 °C10 September 1965	8.8 °C11 July 1965	20.2 °C	2,266 mm	19
1964	31.4 °C18 February 1964	7.5 °C29 July 1964	19.4 °C	1,837 mm	9
1963	34.7 °C14 October 1963	10.0 °C23 June 1963	20.7 °C	1,522 mm	49
1962	31.5 °C8 September 1962	8.5 °C31 May 1962	19.3 °C	2,073 mm	4
1961	37.5 °C28 September 1961	11.7 °C19 June 1961	21.2 °C	1,854 mm	53
1960	34.4 °C25 September 1960	8.3 °C15 July 1960	19.8 °C	1,711 mm	16
1959	33.0 °C7 September 1959	9.7 °C13 June 1959	20.6 °C	1,535 mm	26
1958	33.2 °C15 November 1958	8.2 °C22 June 1958	20.5 °C	1,772 mm	36
1957	33.6 °C19 October 1957	7.8 °C21 July 1957	20.1 °C	1,730 mm	12
1956	33.9 °C2 February 1956	9.0 °C11 August 1956	19.6 °C	1,353 mm	44
1955	33.3 °C1 September 1955	8.7 °C14 July 1955	20.1 °C	1,297 mm	38
1954	33.1 °C18 September 1954	9.9 °C30 August 1954	20.4 °C	2,049 mm	25
1953	31.8 °C30 January 1953	9.5 °C28 July 1953	20.4 °C	1,743 mm	16
1952	32.4 °C6 October 1952	9.1 °C16 July 1952	20.1 °C	1,825 mm	12
1951	34.5 °C23 November 1951	9.9 °C4 June 1951	19.9 °C	1,553 mm	28
1950	32.0 °C14 February 1950	9.1 °C14 July 1950	20.0 °C	1,808 mm	24
1949	31.6 °C18 March 1949	10.2 °C3 July 1949	19.7 °C	1,975 mm	7
1948	36.0 °C27 September 1948	9.8 °C31 August 1948	20.2 °C	1,518 mm	39
1947	33.0 °C8 January 1947	8.1 °C4 August 1947	19.7 °C	1,992 mm	21
1946	31.9 °C19 October 1946	10.4 °C30 July 1946	20.6 °C	2,107 mm	24
1945	31.6 °C28 September 1945	10.0 °C14 July 1945	20.4 °C	2,038 mm	9
1944	33.7 °C7 September 1944	9.2 °C13 July 1944	20.2 °C	1,995 mm	17
1943	30.7 °C19 January 1943	9.1 °C10 August 1943	19.2 °C	1,646 mm	3
1942	34.9 °C6 October 1942	6.6 °C26 June 1942	19.6 °C	1,577 mm	22
1941	33.2 °C12 January 1941	10.0 °C15 September 1941	20.3 °C	2,386 mm	15
1940	33.0 °C12 September 1940	11.3 °C27 September 1940	20.5 °C	2,368 mm	14

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

25.9 °C

+0.6 °C

Hot days (≥ 30 °C)

66 d/yr

+26

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1116 mm

-563 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	28.3 °C	+0.5 °C	248 mm	-28 mm
Feb	31.1 °C	+3.0 °C	54 mm	-168 mm
Mar	28.3 °C	+1.2 °C	117 mm	-98 mm
Apr	25.6 °C	+0.2 °C	155 mm	+38 mm
May	24.6 °C	+1.0 °C	48 mm	-18 mm
Jun	23.3 °C	+0.5 °C	29 mm	-11 mm
Jul	21.7 °C	-0.9 °C	21 mm	-19 mm
Aug	23.7 °C	-0.2 °C	12 mm	-34 mm
Sep	24.8 °C	+0.1 °C	55 mm	-26 mm
Oct	25.2 °C	-0.1 °C	136 mm	+2 mm
Nov	25.7 °C	+0.1 °C	83 mm	-107 mm
Dec	29.1 °C	+2.5 °C	159 mm	-95 mm

The year's extremes

Hottest day

35.3 °C

17 Feb 2025

Coldest day

9.9 °C

17 Jul 2025

Wettest day

56.6 mm

17 Dec 2025

Windiest day

21.9 km/h

22 Sep 2025

Strongest gust

61.2 km/h

10 Dec 2025

Hottest feels-like

39.9 °C

17 Feb 2025

Coldest feels-like

9.1 °C

30 Jul 2025

Sunniest day

13.4 h

23 Dec 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 Rio Claro?

Rio Claro has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.8 °C and it receives 1,679 mm of precipitation per year.

What is the hottest day ever recorded in Rio Claro?

The hottest day measured in Rio Claro between 1940 and 2025 was 28 September 1961, reaching 37.5 °C.

What is the coldest day in Rio Claro?

The coldest day measured in Rio Claro between 1940 and 2025 was 16 August 1978, at 6.2 °C.

Does it snow in Rio Claro?

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

Has the climate of Rio Claro warmed?

Yes: Rio Claro warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Rio Claro?

The wettest day measured in Rio Claro between 1940 and 2025 was 11 March 1954, with 155 mm of rain in 24 hours.

What was the windiest day in Rio Claro?

The windiest day measured in Rio Claro between 1940 and 2025 was 22 September 2025, with winds reaching 21.9 km/h.

What is the warmest month in Rio Claro?

The warmest month in Rio Claro is February (23.7 °C on average); the coldest is July (17.6 °C).

How much does it rain in Rio Claro?

Rio Claro receives on average 1,679 mm of precipitation per year, spread over about 196 rainy days.

Is it sunny in Rio Claro?

Rio Claro gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.

Are there tropical nights in Rio Claro?

Yes: Rio Claro has on average 78 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Rio Claro?

In Rio Claro, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 17 February 1994, and the lowest was 3.7 °C on 16 August 1978.

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