Caicó climate — normals and trends

Q: What is the climate of Caicó?

Caicó has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 28.0 °C and it receives 375 mm of precipitation per year.

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

The hottest day measured in Caicó between 1940 and 2025 was 15 March 1998, reaching 40.5 °C.

Q: What is the coldest day in Caicó?

The coldest day measured in Caicó between 1940 and 2025 was 5 August 1974, at 17.5 °C.

Q: Does it snow in Caicó?

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

Q: Has the climate of Caicó warmed?

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

Q: What is the wettest day in Caicó?

The wettest day measured in Caicó between 1940 and 2025 was 14 April 1985, with 158 mm of rain in 24 hours.

Q: What was the windiest day in Caicó?

The windiest day measured in Caicó between 1940 and 2025 was 19 August 1947, with winds reaching 35.1 km/h.

Q: What is the warmest month in Caicó?

The warmest month in Caicó is December (29.2 °C on average); the coldest is July (26.4 °C).

Q: How much does it rain in Caicó?

Caicó receives on average 375 mm of precipitation per year, spread over about 56 rainy days.

Q: Is it sunny in Caicó?

Caicó gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.

Caicó (Brazil) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 28.0 °C and it receives 375 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 December (29.2 °C on average) and the coldest is July (26.4 °C). Rainfall peaks in March.

Caicó averages 0 frost days, 351 hot days (≥ 30 °C) and 56 rainy days per year.

Caicó has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.

The hottest day of the period reached 40.5 °C (on 15 March 1998) and the coldest 17.5 °C (on 5 August 1974).

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

CaicóRio Grande do Norte

coords: -6.46°, -37.10°
period: 1940–2025 · 86 yrs

BShHot semi-aridWarmest monthDecemberColdest monthJulyWettest monthMarchDriest monthSeptember

Mean daily temperature

28.0°C

Average daily high

34.1°C

Average daily low

22.7°C

Annual rainfall

375mm

Sunshine / day

11.0h

Mean relative humidity

58%

Average peak wind

21.7km/h

Seasonal range

2.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

351 d/yr

Rainy days (≥ 1 mm)

56 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.5 °C

Average feels-like low

24.3 °C

Average peak gust

40.3 km/h

Tropical nights (≥ 20 °C)

356 d/yr

Solar radiation

21.8 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.8 °C

since 1940

+0.1 °C per decade · r² = 0.20 · 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

40.5 °C

15 March 1998

Coldest day

17.5 °C

5 August 1974

Wettest day

158 mm

14 April 1985

Windiest day

35.1 km/h

19 August 1947

Strongest gust

62.3 km/h

19 August 1947

Hottest feels-like

42.4 °C

4 March 2008

Coldest feels-like

16.6 °C

31 July 1981

Sunniest day

12.4 h

2 January 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.9 °C4 November 2025	19.3 °C3 July 2025	28.2 °C	294 mm	360
2024	37.8 °C6 February 2024	18.4 °C16 July 2024	28.1 °C	449 mm	353
2023	37.8 °C25 October 2023	19.5 °C11 July 2023	28.1 °C	352 mm	354
2022	37.8 °C26 February 2022	18.0 °C26 July 2022	27.7 °C	456 mm	340
2021	38.4 °C8 February 2021	19.6 °C27 June 2021	28.4 °C	243 mm	359
2020	37.6 °C28 January 2020	18.8 °C22 July 2020	27.9 °C	692 mm	352
2019	38.4 °C3 December 2019	19.1 °C30 July 2019	28.4 °C	434 mm	359
2018	38.7 °C20 October 2018	19.8 °C30 June 2018	28.4 °C	385 mm	350
2017	38.5 °C25 January 2017	19.2 °C27 July 2017	28.5 °C	343 mm	349
2016	38.4 °C7 December 2016	19.3 °C22 July 2016	28.7 °C	302 mm	359
2015	38.7 °C6 November 2015	19.3 °C1 August 2015	28.4 °C	252 mm	357
2014	37.9 °C18 January 2014	19.2 °C27 July 2014	28.1 °C	258 mm	357
2013	38.7 °C25 March 2013	19.2 °C24 June 2013	28.7 °C	116 mm	360
2012	38.3 °C17 April 2012	18.5 °C29 July 2012	28.3 °C	96 mm	359
2011	37.2 °C10 February 2011	18.3 °C15 July 2011	27.4 °C	527 mm	339
2010	38.8 °C7 March 2010	19.0 °C21 August 2010	28.5 °C	272 mm	361
2009	38.1 °C10 February 2009	19.1 °C17 August 2009	27.7 °C	613 mm	346
2008	39.3 °C11 March 2008	17.6 °C14 July 2008	27.4 °C	847 mm	326
2007	38.1 °C19 October 2007	18.6 °C18 August 2007	28.0 °C	212 mm	357
2006	38.2 °C13 March 2006	19.8 °C19 July 2006	28.3 °C	302 mm	352
2005	38.3 °C10 January 2005	19.5 °C7 August 2005	28.2 °C	240 mm	353
2004	37.9 °C12 December 2004	20.1 °C14 August 2004	28.1 °C	654 mm	335
2003	38.2 °C16 January 2003	20.2 °C23 June 2003	28.4 °C	461 mm	351
2002	37.4 °C21 December 2002	19.7 °C7 July 2002	27.9 °C	361 mm	344
2001	38.2 °C19 February 2001	19.6 °C14 August 2001	28.5 °C	175 mm	360
2000	37.7 °C13 February 2000	19.0 °C12 August 2000	27.7 °C	470 mm	329
1999	38.7 °C6 March 1999	19.3 °C1 August 1999	28.4 °C	342 mm	362
1998	40.5 °C15 March 1998	20.3 °C20 July 1998	29.4 °C	136 mm	361
1997	39.3 °C2 October 1997	19.2 °C6 July 1997	28.3 °C	369 mm	356
1996	38.6 °C13 January 1996	18.7 °C11 August 1996	27.9 °C	607 mm	345
1995	38.6 °C18 October 1995	18.4 °C11 July 1995	28.1 °C	410 mm	356
1994	39.2 °C1 January 1994	19.5 °C15 August 1994	28.0 °C	392 mm	351
1993	38.6 °C3 April 1993	20.2 °C18 July 1993	29.0 °C	85 mm	363
1992	37.4 °C10 October 1992	18.5 °C23 August 1992	28.0 °C	260 mm	358
1991	38.3 °C2 March 1991	18.3 °C8 August 1991	27.9 °C	337 mm	351
1990	38.6 °C14 March 1990	20.0 °C7 August 1990	28.4 °C	170 mm	360
1989	38.4 °C9 March 1989	19.2 °C10 July 1989	27.9 °C	626 mm	343
1988	38.6 °C10 February 1988	19.2 °C30 July 1988	28.2 °C	389 mm	363
1987	38.3 °C6 November 1987	19.9 °C8 September 1987	28.6 °C	322 mm	364
1986	37.8 °C24 December 1986	18.7 °C26 July 1986	27.5 °C	589 mm	346
1985	37.3 °C23 October 1985	19.5 °C20 July 1985	27.1 °C	1,148 mm	337
1984	38.9 °C3 February 1984	18.5 °C27 July 1984	28.1 °C	424 mm	351
1983	38.8 °C1 March 1983	19.3 °C29 July 1983	28.6 °C	127 mm	364
1982	38.3 °C4 February 1982	19.3 °C13 July 1982	28.1 °C	191 mm	363
1981	38.9 °C10 March 1981	18.0 °C31 July 1981	27.8 °C	275 mm	350
1980	38.8 °C30 January 1980	19.1 °C13 September 1980	28.2 °C	344 mm	360
1979	38.2 °C19 February 1979	19.5 °C20 July 1979	28.3 °C	148 mm	361
1978	38.8 °C22 January 1978	19.3 °C1 August 1978	27.9 °C	452 mm	357
1977	38.6 °C8 March 1977	18.8 °C4 August 1977	27.8 °C	446 mm	353
1976	38.1 °C18 January 1976	18.1 °C31 July 1976	27.9 °C	359 mm	358
1975	38.2 °C14 April 1975	18.4 °C26 July 1975	27.6 °C	426 mm	357
1974	37.9 °C24 December 1974	17.5 °C5 August 1974	26.7 °C	1,148 mm	301
1973	38.1 °C22 February 1973	20.4 °C18 June 1973	28.0 °C	663 mm	348
1972	38.5 °C3 February 1972	20.1 °C24 August 1972	28.6 °C	222 mm	361
1971	37.5 °C11 March 1971	19.6 °C23 June 1971	27.7 °C	568 mm	345
1970	38.2 °C15 October 1970	19.7 °C14 August 1970	28.3 °C	336 mm	358
1969	37.9 °C13 January 1969	19.2 °C27 July 1969	28.5 °C	245 mm	361
1968	37.7 °C13 November 1968	18.9 °C24 July 1968	27.6 °C	309 mm	347
1967	37.8 °C20 January 1967	18.6 °C20 July 1967	26.9 °C	779 mm	320
1966	37.6 °C25 October 1966	19.7 °C29 August 1966	27.9 °C	264 mm	352
1965	37.7 °C17 October 1965	19.7 °C30 January 1965	27.6 °C	256 mm	356
1964	37.1 °C6 February 1964	19.5 °C16 June 1964	26.7 °C	828 mm	311
1963	37.9 °C12 November 1963	19.4 °C9 July 1963	27.8 °C	379 mm	359
1962	37.8 °C12 March 1962	19.2 °C17 August 1962	28.4 °C	135 mm	362
1961	38.1 °C8 November 1961	19.4 °C12 August 1961	27.6 °C	384 mm	348
1960	37.9 °C1 February 1960	19.9 °C20 August 1960	27.7 °C	381 mm	336
1959	37.5 °C28 October 1959	19.4 °C27 July 1959	27.7 °C	342 mm	357
1958	38.2 °C18 March 1958	20.2 °C2 August 1958	28.5 °C	90 mm	362
1957	37.8 °C30 November 1957	19.5 °C20 July 1957	27.4 °C	441 mm	347
1956	37.2 °C28 January 1956	18.8 °C30 July 1956	28.0 °C	232 mm	359
1955	37.4 °C24 November 1955	18.8 °C9 July 1955	27.4 °C	323 mm	346
1954	37.8 °C1 January 1954	19.1 °C6 September 1954	27.5 °C	285 mm	354
1953	38.0 °C18 March 1953	20.0 °C21 August 1953	28.4 °C	94 mm	362
1952	38.4 °C28 January 1952	19.8 °C13 September 1952	28.1 °C	263 mm	360
1951	37.7 °C15 March 1951	19.7 °C15 July 1951	27.9 °C	233 mm	359
1950	37.9 °C3 January 1950	19.9 °C8 August 1950	27.6 °C	383 mm	352
1949	37.8 °C9 December 1949	19.8 °C1 August 1949	27.5 °C	471 mm	358
1948	37.3 °C7 November 1948	20.1 °C3 September 1948	27.7 °C	318 mm	361
1947	37.2 °C17 January 1947	19.6 °C14 August 1947	27.6 °C	400 mm	353
1946	38.6 °C4 February 1946	19.7 °C28 July 1946	28.2 °C	124 mm	364
1945	38.1 °C31 January 1945	19.1 °C11 August 1945	27.1 °C	460 mm	343
1944	37.1 °C13 December 1944	19.4 °C27 August 1944	26.8 °C	728 mm	293
1943	37.9 °C19 February 1943	19.3 °C27 August 1943	27.2 °C	179 mm	352
1942	37.2 °C6 March 1942	18.3 °C9 July 1942	27.8 °C	105 mm	360
1941	37.8 °C3 January 1941	19.2 °C22 July 1941	27.9 °C	195 mm	359
1940	37.2 °C8 December 1940	19.2 °C31 March 1940	27.2 °C	522 mm	341

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

34.3 °C

+0.2 °C

Hot days (≥ 30 °C)

360 d/yr

Frost days (< 0 °C)

0 d/yr

Annual rainfall

294 mm

-81 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	34.5 °C	-0.6 °C	102 mm	+60 mm
Feb	34.8 °C	+0.4 °C	36 mm	-32 mm
Mar	34.1 °C	+0.5 °C	59 mm	-51 mm
Apr	35.4 °C	+2.3 °C	31 mm	-54 mm
May	33.5 °C	+0.3 °C	42 mm	+13 mm
Jun	32.6 °C	+0.1 °C	16 mm	+3 mm
Jul	32.4 °C	+0.1 °C	2 mm	-5 mm
Aug	33.1 °C	-0.3 °C	4 mm	+2 mm
Sep	33.8 °C	-0.9 °C	1 mm	+1 mm
Oct	35.1 °C	-0.6 °C	0 mm	-2 mm
Nov	36.3 °C	+0.4 °C	0 mm	-3 mm
Dec	36.1 °C	+0.4 °C	0 mm	-11 mm

The year's extremes

Hottest day

37.9 °C

4 Nov 2025

Coldest day

19.3 °C

3 Jul 2025

Wettest day

22.6 mm

14 Jan 2025

Windiest day

31.3 km/h

25 Oct 2025

Strongest gust

56.9 km/h

5 Oct 2025

Hottest feels-like

40.7 °C

11 Apr 2025

Coldest feels-like

18.8 °C

23 Aug 2025

Sunniest day

12.4 h

1 Jan 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 Caicó?

Caicó has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 28.0 °C and it receives 375 mm of precipitation per year.

What is the hottest day ever recorded in Caicó?

The hottest day measured in Caicó between 1940 and 2025 was 15 March 1998, reaching 40.5 °C.

What is the coldest day in Caicó?

The coldest day measured in Caicó between 1940 and 2025 was 5 August 1974, at 17.5 °C.

Does it snow in Caicó?

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

Has the climate of Caicó warmed?

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

What is the wettest day in Caicó?

The wettest day measured in Caicó between 1940 and 2025 was 14 April 1985, with 158 mm of rain in 24 hours.

What was the windiest day in Caicó?

The windiest day measured in Caicó between 1940 and 2025 was 19 August 1947, with winds reaching 35.1 km/h.

What is the warmest month in Caicó?

The warmest month in Caicó is December (29.2 °C on average); the coldest is July (26.4 °C).

How much does it rain in Caicó?

Caicó receives on average 375 mm of precipitation per year, spread over about 56 rainy days.

Is it sunny in Caicó?

Caicó gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.

Are there tropical nights in Caicó?

Yes: Caicó has on average 356 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Caicó?

In Caicó, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 4 March 2008, and the lowest was 16.6 °C on 31 July 1981.

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