San Nicolás de los Arroyos climate — normals and trends

Q: What is the climate of San Nicolás de los Arroyos?

San Nicolás de los Arroyos has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.9 °C and it receives 978 mm of precipitation per year.

Q: What is the hottest day ever recorded in San Nicolás de los Arroyos?

The hottest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 13 January 2022, reaching 41.6 °C.

Q: What is the coldest day in San Nicolás de los Arroyos?

The coldest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 10 July 2024, at -3.3 °C.

Q: Does it snow in San Nicolás de los Arroyos?

Almost never: San Nicolás de los Arroyos sees virtually no snow, with about 2 frost days per year.

Q: Has the climate of San Nicolás de los Arroyos warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in San Nicolás de los Arroyos.

Q: What is the wettest day in San Nicolás de los Arroyos?

The wettest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 15 January 2017, with 152 mm of rain in 24 hours.

Q: What was the windiest day in San Nicolás de los Arroyos?

The windiest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 29 May 1984, with winds reaching 49.9 km/h.

Q: What is the warmest month in San Nicolás de los Arroyos?

The warmest month in San Nicolás de los Arroyos is January (25.0 °C on average); the coldest is July (11.1 °C).

Q: How much does it rain in San Nicolás de los Arroyos?

San Nicolás de los Arroyos receives on average 978 mm of precipitation per year, spread over about 86 rainy days.

Q: Is it sunny in San Nicolás de los Arroyos?

San Nicolás de los Arroyos gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.

San Nicolás de los Arroyos (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.9 °C and it receives 978 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 January (25.0 °C on average) and the coldest is July (11.1 °C). Rainfall peaks in March.

San Nicolás de los Arroyos averages 2 frost days, 59 hot days (≥ 30 °C) and 86 rainy days per year.

No statistically significant temperature trend emerges for San Nicolás de los Arroyos between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.

The hottest day of the period reached 41.6 °C (on 13 January 2022) and the coldest -3.3 °C (on 10 July 2024).

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

San Nicolás de los ArroyosBuenos Aires

coords: -33.33°, -60.21°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJanuaryColdest monthJulyWettest monthMarchDriest monthJune

Mean daily temperature

17.9°C

Average daily high

23.2°C

Average daily low

13.2°C

Annual rainfall

978mm

Sunshine / day

9.5h

Mean relative humidity

72%

Average peak wind

16.2km/h

Seasonal range

13.9°C

Frost days (< 0 °C)

2 d/yr

Hot days (≥ 30 °C)

59 d/yr

Rainy days (≥ 1 mm)

86 d/yr

Annual snowfall

0.0 cm

Average feels-like high

23.4 °C

Average feels-like low

12.2 °C

Average peak gust

33.0 km/h

Tropical nights (≥ 20 °C)

45 d/yr

Solar radiation

17.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

No clear trend over this period

Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.

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

41.6 °C

13 January 2022

Coldest day

-3.3 °C

10 July 2024

Wettest day

152 mm

15 January 2017

Windiest day

49.9 km/h

29 May 1984

Strongest gust

103.0 km/h

17 October 1982

Hottest feels-like

44.2 °C

13 January 2022

Coldest feels-like

-7.1 °C

9 July 1945

Snowiest day

0.3 cm

6 July 1960

Sunniest day

14.0 h

4 January 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	38.6 °C16 January 2025	-2.2 °C1 July 2025	18.7 °C	943 mm	84	3
2024	37.7 °C7 February 2024	-3.3 °C10 July 2024	18.5 °C	841 mm	79	7
2023	39.5 °C11 March 2023	0.2 °C12 June 2023	19.1 °C	810 mm	87	0
2022	41.6 °C13 January 2022	-1.2 °C11 June 2022	18.2 °C	551 mm	80	2
2021	38.8 °C29 December 2021	-1.0 °C19 July 2021	18.5 °C	572 mm	80	3
2020	36.7 °C24 November 2020	-3.0 °C14 July 2020	18.3 °C	658 mm	73	2
2019	36.8 °C10 December 2019	-1.0 °C14 August 2019	18.0 °C	888 mm	54	4
2018	37.5 °C11 January 2018	-1.3 °C24 June 2018	18.4 °C	931 mm	79	2
2017	36.4 °C30 December 2017	-0.4 °C17 July 2017	18.7 °C	1,094 mm	61	1
2016	37.3 °C22 January 2016	0.8 °C17 July 2016	17.7 °C	1,178 mm	66	0
2015	35.2 °C28 December 2015	-1.1 °C21 July 2015	18.5 °C	945 mm	64	2
2014	38.3 °C23 January 2014	0.9 °C13 August 2014	18.2 °C	1,236 mm	57	0
2013	37.3 °C26 December 2013	-1.7 °C14 August 2013	18.1 °C	729 mm	72	3
2012	39.4 °C9 January 2012	-2.2 °C7 June 2012	18.4 °C	1,533 mm	70	5
2011	37.1 °C15 January 2011	-1.9 °C4 July 2011	17.7 °C	810 mm	60	4
2010	36.1 °C7 November 2010	-1.8 °C16 July 2010	17.7 °C	920 mm	64	2
2009	36.8 °C17 January 2009	-0.7 °C24 June 2009	17.8 °C	1,163 mm	59	3
2008	38.0 °C9 January 2008	-1.8 °C30 May 2008	18.5 °C	591 mm	74	2
2007	36.4 °C1 January 2007	-1.1 °C11 July 2007	17.1 °C	1,299 mm	56	3
2006	39.8 °C9 January 2006	-1.9 °C31 July 2006	18.3 °C	901 mm	58	2
2005	36.8 °C7 January 2005	0.8 °C19 July 2005	17.7 °C	800 mm	59	0
2004	36.8 °C27 January 2004	-2.1 °C11 July 2004	18.0 °C	831 mm	59	1
2003	37.2 °C31 January 2003	0.1 °C11 July 2003	17.7 °C	1,245 mm	50	0
2002	36.2 °C14 November 2002	-0.1 °C23 June 2002	18.0 °C	1,481 mm	54	1
2001	36.2 °C4 March 2001	0.0 °C28 July 2001	18.3 °C	1,307 mm	65	0
2000	37.0 °C20 January 2000	-0.6 °C23 July 2000	17.4 °C	1,495 mm	51	1
1999	38.4 °C26 December 1999	-1.7 °C15 August 1999	17.5 °C	958 mm	56	1
1998	34.6 °C27 December 1998	2.3 °C12 August 1998	17.3 °C	958 mm	28	0
1997	34.9 °C5 January 1997	-2.1 °C5 August 1997	18.4 °C	972 mm	67	1
1996	36.7 °C3 January 1996	-2.5 °C29 June 1996	17.8 °C	1,050 mm	57	2
1995	38.5 °C18 December 1995	-2.2 °C4 August 1995	17.4 °C	725 mm	60	4
1994	37.1 °C10 December 1994	-0.8 °C23 July 1994	18.0 °C	884 mm	67	2
1993	34.8 °C13 January 1993	-1.8 °C1 June 1993	17.2 °C	1,378 mm	53	3
1992	34.7 °C7 February 1992	-1.1 °C16 July 1992	17.2 °C	1,181 mm	41	2
1991	35.8 °C26 February 1991	-2.3 °C2 August 1991	17.5 °C	1,115 mm	34	3
1990	39.5 °C27 January 1990	-1.4 °C22 July 1990	17.6 °C	1,383 mm	34	2
1989	37.8 °C5 January 1989	-0.3 °C5 July 1989	18.1 °C	823 mm	70	1
1988	36.9 °C4 December 1988	-2.7 °C11 July 1988	17.2 °C	883 mm	70	4
1987	37.7 °C29 January 1987	-0.4 °C14 June 1987	17.7 °C	899 mm	62	2
1986	39.1 °C25 January 1986	1.5 °C21 July 1986	18.2 °C	1,090 mm	51	0
1985	36.8 °C10 January 1985	-0.1 °C6 July 1985	18.1 °C	1,005 mm	63	1
1984	37.2 °C28 January 1984	-2.0 °C27 June 1984	17.2 °C	1,272 mm	40	6
1983	39.0 °C27 December 1983	-0.7 °C30 July 1983	17.5 °C	961 mm	55	2
1982	36.1 °C28 December 1982	0.5 °C16 June 1982	18.1 °C	905 mm	54	0
1981	35.2 °C29 December 1981	-0.1 °C18 June 1981	18.0 °C	1,161 mm	50	2
1980	37.2 °C22 January 1980	-3.1 °C2 July 1980	18.1 °C	906 mm	64	5
1979	36.2 °C3 February 1979	-1.0 °C20 July 1979	17.5 °C	807 mm	44	3
1978	34.9 °C28 December 1978	-0.9 °C14 August 1978	17.5 °C	1,338 mm	42	1
1977	35.1 °C9 January 1977	-0.2 °C1 September 1977	17.9 °C	841 mm	55	2
1976	36.1 °C17 January 1976	-1.8 °C9 July 1976	16.9 °C	1,030 mm	41	3
1975	37.6 °C18 December 1975	-1.6 °C26 July 1975	17.4 °C	1,044 mm	55	2
1974	37.3 °C19 January 1974	-1.3 °C18 August 1974	17.5 °C	684 mm	47	3
1973	34.5 °C30 December 1973	0.3 °C17 July 1973	17.1 °C	1,197 mm	33	0
1972	38.7 °C11 January 1972	-2.4 °C4 August 1972	17.6 °C	979 mm	52	2
1971	39.1 °C29 December 1971	-0.9 °C14 August 1971	17.2 °C	885 mm	54	3
1970	35.8 °C26 February 1970	-0.9 °C1 July 1970	17.7 °C	992 mm	58	3
1969	37.3 °C30 January 1969	-0.8 °C18 June 1969	17.8 °C	1,047 mm	57	2
1968	39.7 °C11 December 1968	-0.6 °C5 July 1968	17.6 °C	1,130 mm	56	1
1967	37.9 °C27 December 1967	-3.0 °C14 June 1967	17.7 °C	1,302 mm	58	2
1966	34.8 °C4 February 1966	-0.7 °C2 September 1966	17.3 °C	1,050 mm	50	1
1965	38.6 °C18 February 1965	-2.8 °C11 July 1965	17.6 °C	766 mm	71	3
1964	37.8 °C25 January 1964	-1.3 °C24 June 1964	16.8 °C	848 mm	51	4
1963	38.0 °C1 January 1963	-0.6 °C5 August 1963	17.4 °C	1,154 mm	37	1
1962	37.0 °C23 December 1962	-2.2 °C25 July 1962	16.9 °C	679 mm	67	6
1961	36.3 °C20 January 1961	-1.9 °C14 June 1961	17.6 °C	1,044 mm	47	3
1960	36.1 °C11 February 1960	-1.8 °C8 July 1960	17.6 °C	902 mm	69	3
1959	36.0 °C4 February 1959	1.9 °C16 July 1959	17.4 °C	1,143 mm	40	0
1958	35.4 °C7 January 1958	1.6 °C29 August 1958	17.6 °C	1,114 mm	28	0
1957	41.3 °C11 January 1957	-0.6 °C1 August 1957	17.9 °C	1,185 mm	66	3
1956	38.0 °C4 January 1956	2.2 °C11 June 1956	18.8 °C	587 mm	83	0
1955	39.6 °C5 January 1955	-0.2 °C29 July 1955	18.1 °C	881 mm	61	1
1954	36.6 °C26 December 1954	2.2 °C4 August 1954	18.0 °C	796 mm	64	0
1953	36.8 °C11 January 1953	2.5 °C20 July 1953	18.6 °C	1,016 mm	37	0
1952	38.6 °C27 December 1952	2.7 °C19 June 1952	18.3 °C	928 mm	69	0
1951	34.6 °C21 February 1951	0.7 °C5 August 1951	18.6 °C	1,244 mm	43	0
1950	38.8 °C29 January 1950	1.2 °C31 July 1950	18.6 °C	654 mm	91	0
1949	38.8 °C25 February 1949	1.4 °C16 July 1949	18.2 °C	820 mm	76	0
1948	36.1 °C21 January 1948	2.5 °C8 August 1948	18.8 °C	1,074 mm	71	0
1947	38.5 °C31 January 1947	1.3 °C9 July 1947	19.2 °C	565 mm	83	0
1946	39.8 °C13 February 1946	2.2 °C29 June 1946	18.6 °C	825 mm	73	0
1945	37.4 °C8 January 1945	-2.8 °C9 July 1945	18.7 °C	746 mm	89	1
1944	36.3 °C5 February 1944	0.3 °C26 June 1944	18.8 °C	823 mm	60	0
1943	38.4 °C21 January 1943	1.5 °C23 August 1943	19.4 °C	852 mm	81	0
1942	34.9 °C11 January 1942	0.5 °C16 June 1942	17.6 °C	1,043 mm	54	0
1941	37.0 °C15 February 1941	1.9 °C18 July 1941	18.1 °C	779 mm	49	0
1940	34.6 °C29 December 1940	3.0 °C24 May 1940	17.6 °C	1,045 mm	43	0

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

24.2 °C

+1.0 °C

Hot days (≥ 30 °C)

84 d/yr

+25

Frost days (< 0 °C)

3 d/yr

Annual rainfall

943 mm

-35 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.6 °C	+2.0 °C	75 mm	-23 mm
Feb	31.1 °C	+1.8 °C	132 mm	+29 mm
Mar	27.6 °C	+0.5 °C	104 mm	-18 mm
Apr	22.9 °C	-0.3 °C	47 mm	-44 mm
May	21.1 °C	+1.7 °C	136 mm	+69 mm
Jun	15.5 °C	-0.6 °C	11 mm	-30 mm
Jul	17.0 °C	+1.1 °C	38 mm	-9 mm
Aug	18.6 °C	+0.7 °C	145 mm	+91 mm
Sep	21.3 °C	+1.1 °C	72 mm	+2 mm
Oct	24.9 °C	+1.8 °C	55 mm	-46 mm
Nov	26.6 °C	+0.3 °C	106 mm	+7 mm
Dec	31.5 °C	+2.3 °C	23 mm	-64 mm

The year's extremes

Hottest day

38.6 °C

16 Jan 2025

Coldest day

-2.2 °C

1 Jul 2025

Wettest day

61.3 mm

19 Aug 2025

Windiest day

37.4 km/h

27 Sep 2025

Strongest gust

68.8 km/h

31 Aug 2025

Hottest feels-like

41.9 °C

3 Feb 2025

Coldest feels-like

-5.6 °C

2 Jul 2025

Sunniest day

14.0 h

2 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 San Nicolás de los Arroyos?

San Nicolás de los Arroyos has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.9 °C and it receives 978 mm of precipitation per year.

What is the hottest day ever recorded in San Nicolás de los Arroyos?

The hottest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 13 January 2022, reaching 41.6 °C.

What is the coldest day in San Nicolás de los Arroyos?

The coldest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 10 July 2024, at -3.3 °C.

Does it snow in San Nicolás de los Arroyos?

Almost never: San Nicolás de los Arroyos sees virtually no snow, with about 2 frost days per year.

Has the climate of San Nicolás de los Arroyos warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in San Nicolás de los Arroyos.

What is the wettest day in San Nicolás de los Arroyos?

The wettest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 15 January 2017, with 152 mm of rain in 24 hours.

What was the windiest day in San Nicolás de los Arroyos?

The windiest day measured in San Nicolás de los Arroyos between 1940 and 2025 was 29 May 1984, with winds reaching 49.9 km/h.

What is the warmest month in San Nicolás de los Arroyos?

The warmest month in San Nicolás de los Arroyos is January (25.0 °C on average); the coldest is July (11.1 °C).

How much does it rain in San Nicolás de los Arroyos?

San Nicolás de los Arroyos receives on average 978 mm of precipitation per year, spread over about 86 rainy days.

Is it sunny in San Nicolás de los Arroyos?

San Nicolás de los Arroyos gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.

What is the biggest single-day snowfall in San Nicolás de los Arroyos?

The heaviest 24-hour snowfall measured in San Nicolás de los Arroyos between 1940 and 2025 was 6 July 1960, with 0.3 cm.

Are there tropical nights in San Nicolás de los Arroyos?

Yes: San Nicolás de los Arroyos has on average 45 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in San Nicolás de los Arroyos?

In San Nicolás de los Arroyos, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 13 January 2022, and the lowest was -7.1 °C on 9 July 1945.

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