Arroyo Seco climate — normals and trends

Q: What is the climate of Arroyo Seco?

Arroyo Seco has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.7 °C and it receives 978 mm of precipitation per year.

Q: What is the hottest day ever recorded in Arroyo Seco?

The hottest day measured in Arroyo Seco between 1940 and 2025 was 11 January 1957, reaching 41.4 °C.

Q: What is the coldest day in Arroyo Seco?

The coldest day measured in Arroyo Seco between 1940 and 2025 was 10 July 2024, at -5.0 °C.

Q: Does it snow in Arroyo Seco?

Almost never: Arroyo Seco sees virtually no snow, with about 4 frost days per year.

Q: Has the climate of Arroyo Seco warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in Arroyo Seco.

Q: What is the wettest day in Arroyo Seco?

The wettest day measured in Arroyo Seco between 1940 and 2025 was 15 January 2017, with 156 mm of rain in 24 hours.

Q: What was the windiest day in Arroyo Seco?

The windiest day measured in Arroyo Seco between 1940 and 2025 was 29 May 1984, with winds reaching 50.9 km/h.

Q: What is the warmest month in Arroyo Seco?

The warmest month in Arroyo Seco is January (24.9 °C on average); the coldest is July (10.7 °C).

Q: How much does it rain in Arroyo Seco?

Arroyo Seco receives on average 978 mm of precipitation per year, spread over about 87 rainy days.

Q: Is it sunny in Arroyo Seco?

Arroyo Seco gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.

Arroyo Seco (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.7 °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 (24.9 °C on average) and the coldest is July (10.7 °C). Rainfall peaks in March.

Arroyo Seco averages 4 frost days, 59 hot days (≥ 30 °C) and 87 rainy days per year.

No statistically significant temperature trend emerges for Arroyo Seco between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.

The hottest day of the period reached 41.4 °C (on 11 January 1957) and the coldest -5.0 °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

Arroyo SecoSanta Fe

coords: -33.15°, -60.51°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJanuaryColdest monthJulyWettest monthMarchDriest monthJune

Mean daily temperature

17.7°C

Average daily high

23.1°C

Average daily low

12.9°C

Annual rainfall

978mm

Sunshine / day

9.6h

Mean relative humidity

71%

Average peak wind

17.1km/h

Seasonal range

14.2°C

Frost days (< 0 °C)

4 d/yr

Hot days (≥ 30 °C)

59 d/yr

Rainy days (≥ 1 mm)

87 d/yr

Annual snowfall

0.0 cm

Average feels-like high

23.2 °C

Average feels-like low

11.6 °C

Average peak gust

32.9 km/h

Tropical nights (≥ 20 °C)

41 d/yr

Solar radiation

17.5 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

41.4 °C

11 January 1957

Coldest day

-5.0 °C

10 July 2024

Wettest day

156 mm

15 January 2017

Windiest day

50.9 km/h

29 May 1984

Strongest gust

101.5 km/h

17 October 1982

Hottest feels-like

44.1 °C

27 January 1990

Coldest feels-like

-9.1 °C

10 July 2024

Snowiest day

1.1 cm

6 July 1960

Sunniest day

14.0 h

9 December 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	38.3 °C16 January 2025	-3.0 °C1 July 2025	18.4 °C	918 mm	82	5
2024	37.3 °C1 February 2024	-5.0 °C10 July 2024	18.3 °C	854 mm	73	10
2023	39.0 °C11 February 2023	-1.2 °C12 June 2023	18.8 °C	782 mm	86	3
2022	41.2 °C13 January 2022	-2.5 °C11 June 2022	18.0 °C	545 mm	78	5
2021	38.5 °C29 December 2021	-2.0 °C19 July 2021	18.3 °C	597 mm	80	5
2020	37.0 °C18 October 2020	-4.6 °C14 July 2020	18.1 °C	654 mm	72	5
2019	37.1 °C10 December 2019	-2.3 °C6 July 2019	17.8 °C	901 mm	52	4
2018	36.9 °C11 January 2018	-2.4 °C24 June 2018	18.1 °C	951 mm	75	4
2017	35.6 °C30 December 2017	-1.3 °C17 July 2017	18.4 °C	1,095 mm	58	3
2016	37.4 °C12 December 2016	0.1 °C17 July 2016	17.5 °C	1,162 mm	61	0
2015	34.9 °C28 December 2015	-2.0 °C21 July 2015	18.3 °C	1,005 mm	60	4
2014	38.1 °C23 January 2014	-0.2 °C13 August 2014	17.9 °C	1,182 mm	56	1
2013	36.7 °C1 February 2013	-2.4 °C23 July 2013	17.9 °C	752 mm	70	4
2012	39.3 °C9 January 2012	-3.4 °C7 June 2012	18.1 °C	1,480 mm	69	7
2011	37.4 °C20 December 2011	-3.0 °C4 July 2011	17.5 °C	776 mm	60	9
2010	36.7 °C7 November 2010	-2.9 °C16 July 2010	17.4 °C	913 mm	61	5
2009	36.3 °C17 January 2009	-1.5 °C24 June 2009	17.6 °C	1,136 mm	56	5
2008	37.8 °C9 January 2008	-2.6 °C30 May 2008	18.4 °C	584 mm	77	2
2007	36.4 °C1 January 2007	-2.4 °C11 July 2007	16.8 °C	1,268 mm	55	8
2006	39.9 °C9 January 2006	-2.2 °C31 July 2006	18.1 °C	889 mm	60	2
2005	36.6 °C5 January 2005	-0.2 °C6 July 2005	17.4 °C	852 mm	53	2
2004	36.4 °C27 January 2004	-3.2 °C11 July 2004	17.8 °C	810 mm	58	3
2003	37.4 °C31 January 2003	-1.3 °C11 July 2003	17.4 °C	1,241 mm	50	2
2002	36.3 °C27 February 2002	-1.0 °C23 June 2002	17.7 °C	1,502 mm	51	3
2001	36.0 °C4 March 2001	-0.8 °C28 July 2001	18.0 °C	1,257 mm	64	1
2000	37.0 °C20 January 2000	-1.5 °C23 July 2000	17.1 °C	1,444 mm	47	5
1999	38.4 °C26 December 1999	-3.0 °C15 August 1999	17.2 °C	978 mm	53	4
1998	34.5 °C27 December 1998	1.7 °C13 August 1998	17.1 °C	978 mm	26	0
1997	34.8 °C5 January 1997	-2.5 °C5 August 1997	18.2 °C	898 mm	67	2
1996	35.7 °C3 January 1996	-3.5 °C29 June 1996	17.5 °C	1,070 mm	52	5
1995	38.8 °C18 December 1995	-2.9 °C4 August 1995	17.2 °C	705 mm	58	7
1994	37.3 °C10 December 1994	-1.2 °C23 July 1994	17.8 °C	898 mm	65	2
1993	34.3 °C13 January 1993	-3.0 °C14 July 1993	17.0 °C	1,406 mm	52	6
1992	34.5 °C7 February 1992	-1.8 °C16 July 1992	16.9 °C	1,222 mm	42	7
1991	35.4 °C26 February 1991	-3.6 °C2 August 1991	17.2 °C	1,115 mm	33	5
1990	40.3 °C27 January 1990	-2.1 °C22 July 1990	17.3 °C	1,434 mm	32	8
1989	37.9 °C5 January 1989	-1.2 °C7 July 1989	17.9 °C	819 mm	64	3
1988	37.3 °C3 December 1988	-3.9 °C12 July 1988	16.9 °C	914 mm	70	8
1987	37.5 °C28 January 1987	-0.8 °C13 June 1987	17.5 °C	919 mm	60	4
1986	39.3 °C25 January 1986	1.5 °C21 July 1986	18.0 °C	1,038 mm	48	0
1985	36.9 °C10 January 1985	-0.9 °C6 July 1985	17.8 °C	1,020 mm	63	2
1984	37.2 °C28 January 1984	-2.8 °C27 June 1984	16.9 °C	1,257 mm	41	8
1983	39.1 °C27 December 1983	-1.9 °C5 June 1983	17.2 °C	879 mm	56	4
1982	36.3 °C26 January 1982	-0.5 °C16 June 1982	17.9 °C	870 mm	55	1
1981	35.9 °C29 December 1981	-2.4 °C19 July 1981	17.7 °C	1,191 mm	49	6
1980	37.6 °C22 January 1980	-4.5 °C2 July 1980	17.8 °C	935 mm	63	6
1979	35.9 °C3 February 1979	-1.7 °C20 July 1979	17.2 °C	818 mm	45	4
1978	35.3 °C26 February 1978	-2.2 °C14 August 1978	17.3 °C	1,367 mm	41	3
1977	34.9 °C9 January 1977	-0.3 °C22 June 1977	17.6 °C	818 mm	51	5
1976	35.6 °C17 January 1976	-2.7 °C9 July 1976	16.7 °C	1,027 mm	41	5
1975	38.2 °C18 December 1975	-3.2 °C26 July 1975	17.1 °C	1,039 mm	55	4
1974	37.9 °C19 January 1974	-2.1 °C18 August 1974	17.3 °C	700 mm	47	7
1973	34.5 °C30 December 1973	-0.4 °C19 August 1973	16.8 °C	1,131 mm	32	2
1972	39.2 °C11 January 1972	-3.4 °C4 August 1972	17.4 °C	968 mm	53	5
1971	40.1 °C29 December 1971	-1.6 °C23 June 1971	17.0 °C	828 mm	58	5
1970	36.2 °C26 February 1970	-2.0 °C1 July 1970	17.5 °C	959 mm	59	5
1969	37.5 °C30 January 1969	-1.6 °C18 June 1969	17.6 °C	1,018 mm	60	4
1968	40.2 °C11 December 1968	-0.8 °C5 July 1968	17.5 °C	1,095 mm	58	2
1967	38.2 °C27 December 1967	-3.7 °C13 June 1967	17.4 °C	1,301 mm	59	6
1966	34.5 °C4 February 1966	-1.0 °C2 September 1966	17.1 °C	1,052 mm	50	4
1965	38.7 °C18 February 1965	-3.2 °C11 July 1965	17.4 °C	739 mm	69	5
1964	37.6 °C25 January 1964	-2.3 °C2 August 1964	16.6 °C	901 mm	52	5
1963	38.3 °C1 January 1963	-1.4 °C5 August 1963	17.2 °C	1,116 mm	39	2
1962	37.8 °C23 December 1962	-2.8 °C25 July 1962	16.8 °C	653 mm	69	8
1961	36.0 °C20 January 1961	-3.2 °C15 June 1961	17.3 °C	1,007 mm	46	7
1960	36.5 °C23 February 1960	-2.8 °C8 July 1960	17.4 °C	925 mm	69	5
1959	35.8 °C4 February 1959	1.1 °C23 June 1959	17.2 °C	1,149 mm	38	0
1958	35.0 °C7 January 1958	0.3 °C10 August 1958	17.3 °C	1,201 mm	24	0
1957	41.4 °C11 January 1957	-1.6 °C1 August 1957	17.8 °C	1,243 mm	67	5
1956	37.8 °C4 January 1956	1.5 °C11 June 1956	18.7 °C	574 mm	84	0
1955	39.7 °C5 January 1955	-1.0 °C29 July 1955	17.9 °C	931 mm	62	2
1954	36.9 °C26 December 1954	1.4 °C4 August 1954	17.8 °C	828 mm	60	0
1953	36.8 °C11 January 1953	2.8 °C19 July 1953	18.4 °C	1,030 mm	39	0
1952	38.8 °C27 December 1952	1.8 °C28 June 1952	18.2 °C	949 mm	68	0
1951	35.1 °C21 February 1951	-0.4 °C5 August 1951	18.4 °C	1,288 mm	45	1
1950	39.1 °C29 January 1950	0.8 °C31 July 1950	18.5 °C	661 mm	92	0
1949	39.1 °C25 February 1949	0.7 °C16 July 1949	18.1 °C	810 mm	83	0
1948	37.0 °C21 January 1948	2.2 °C8 August 1948	18.6 °C	1,111 mm	75	0
1947	38.8 °C31 January 1947	0.5 °C9 July 1947	19.1 °C	560 mm	87	0
1946	39.6 °C13 February 1946	1.9 °C24 July 1946	18.5 °C	855 mm	72	0
1945	37.3 °C8 January 1945	-3.9 °C9 July 1945	18.5 °C	769 mm	87	4
1944	36.2 °C7 February 1944	-0.8 °C26 June 1944	18.6 °C	766 mm	60	1
1943	38.4 °C21 January 1943	1.0 °C6 July 1943	19.2 °C	930 mm	85	0
1942	35.1 °C11 January 1942	-0.9 °C19 June 1942	17.4 °C	1,068 mm	54	2
1941	36.8 °C15 February 1941	0.8 °C25 June 1941	18.0 °C	715 mm	50	0
1940	35.0 °C29 December 1940	1.9 °C1 July 1940	17.4 °C	1,068 mm	40	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

24.1 °C

+1.0 °C

Hot days (≥ 30 °C)

82 d/yr

+23

Frost days (< 0 °C)

5 d/yr

Annual rainfall

918 mm

-60 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.4 °C	+1.9 °C	53 mm	-47 mm
Feb	30.9 °C	+1.7 °C	125 mm	+20 mm
Mar	27.3 °C	+0.3 °C	127 mm	+2 mm
Apr	22.7 °C	-0.4 °C	46 mm	-46 mm
May	21.1 °C	+1.8 °C	117 mm	+52 mm
Jun	15.5 °C	-0.5 °C	9 mm	-30 mm
Jul	16.9 °C	+1.1 °C	35 mm	-9 mm
Aug	18.6 °C	+0.8 °C	142 mm	+91 mm
Sep	21.3 °C	+1.1 °C	72 mm	+4 mm
Oct	24.9 °C	+1.9 °C	53 mm	-48 mm
Nov	26.7 °C	+0.3 °C	110 mm	+11 mm
Dec	31.7 °C	+2.5 °C	29 mm	-60 mm

The year's extremes

Hottest day

38.3 °C

16 Jan 2025

Coldest day

-3.0 °C

1 Jul 2025

Wettest day

59.5 mm

31 Aug 2025

Windiest day

42.5 km/h

27 Sep 2025

Strongest gust

73.8 km/h

31 Aug 2025

Hottest feels-like

41.9 °C

21 Feb 2025

Coldest feels-like

-6.4 °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 Arroyo Seco?

Arroyo Seco has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.7 °C and it receives 978 mm of precipitation per year.

What is the hottest day ever recorded in Arroyo Seco?

The hottest day measured in Arroyo Seco between 1940 and 2025 was 11 January 1957, reaching 41.4 °C.

What is the coldest day in Arroyo Seco?

The coldest day measured in Arroyo Seco between 1940 and 2025 was 10 July 2024, at -5.0 °C.

Does it snow in Arroyo Seco?

Almost never: Arroyo Seco sees virtually no snow, with about 4 frost days per year.

Has the climate of Arroyo Seco warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in Arroyo Seco.

What is the wettest day in Arroyo Seco?

The wettest day measured in Arroyo Seco between 1940 and 2025 was 15 January 2017, with 156 mm of rain in 24 hours.

What was the windiest day in Arroyo Seco?

The windiest day measured in Arroyo Seco between 1940 and 2025 was 29 May 1984, with winds reaching 50.9 km/h.

What is the warmest month in Arroyo Seco?

The warmest month in Arroyo Seco is January (24.9 °C on average); the coldest is July (10.7 °C).

How much does it rain in Arroyo Seco?

Arroyo Seco receives on average 978 mm of precipitation per year, spread over about 87 rainy days.

Is it sunny in Arroyo Seco?

Arroyo Seco gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.

What is the biggest single-day snowfall in Arroyo Seco?

The heaviest 24-hour snowfall measured in Arroyo Seco between 1940 and 2025 was 6 July 1960, with 1.1 cm.

Are there tropical nights in Arroyo Seco?

Yes: Arroyo Seco has on average 41 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Arroyo Seco?

In Arroyo Seco, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 27 January 1990, and the lowest was -9.1 °C on 10 July 2024.

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