San Justo climate — normals and trends

Q: What is the climate of San Justo?

San Justo has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 19.2 °C and it receives 1,160 mm of precipitation per year.

Q: What is the hottest day ever recorded in San Justo?

The hottest day measured in San Justo between 1940 and 2025 was 30 December 2013, reaching 41.5 °C.

Q: What is the coldest day in San Justo?

The coldest day measured in San Justo between 1940 and 2025 was 10 July 1976, at -5.4 °C.

Q: Does it snow in San Justo?

Almost never: San Justo sees virtually no snow, with about 3 frost days per year.

Q: Has the climate of San Justo warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in San Justo.

Q: What is the wettest day in San Justo?

The wettest day measured in San Justo between 1940 and 2025 was 3 January 2019, with 212 mm of rain in 24 hours.

Q: What was the windiest day in San Justo?

The windiest day measured in San Justo between 1940 and 2025 was 17 October 1982, with winds reaching 47.0 km/h.

Q: What is the warmest month in San Justo?

The warmest month in San Justo is January (25.8 °C on average); the coldest is July (12.5 °C).

Q: How much does it rain in San Justo?

San Justo receives on average 1,160 mm of precipitation per year, spread over about 92 rainy days.

Q: Is it sunny in San Justo?

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

San Justo (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 19.2 °C and it receives 1,160 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 (25.8 °C on average) and the coldest is July (12.5 °C). Rainfall peaks in March.

San Justo averages 3 frost days, 80 hot days (≥ 30 °C) and 92 rainy days per year.

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

The hottest day of the period reached 41.5 °C (on 30 December 2013) and the coldest -5.4 °C (on 10 July 1976).

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 JustoSanta Fe

coords: -30.79°, -60.59°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJanuaryColdest monthJulyWettest monthMarchDriest monthJuly

Mean daily temperature

19.2°C

Average daily high

24.6°C

Average daily low

14.2°C

Annual rainfall

1,160mm

Sunshine / day

9.6h

Mean relative humidity

72%

Average peak wind

16.9km/h

Seasonal range

13.3°C

Frost days (< 0 °C)

3 d/yr

Hot days (≥ 30 °C)

80 d/yr

Rainy days (≥ 1 mm)

92 d/yr

Annual snowfall

0.0 cm

Average feels-like high

25.4 °C

Average feels-like low

13.4 °C

Average peak gust

33.5 km/h

Tropical nights (≥ 20 °C)

66 d/yr

Solar radiation

17.6 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

41.5 °C

30 December 2013

Coldest day

-5.4 °C

10 July 1976

Wettest day

212 mm

3 January 2019

Windiest day

47.0 km/h

17 October 1982

Strongest gust

94.7 km/h

17 October 1982

Hottest feels-like

47.1 °C

12 January 1973

Coldest feels-like

-9.3 °C

10 July 1976

Snowiest day

0.1 cm

3 August 1951

Sunniest day

14.0 h

15 December 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	40.0 °C10 February 2025	-4.0 °C1 July 2025	19.8 °C	960 mm	110	5
2024	39.3 °C3 February 2024	-2.6 °C12 July 2024	19.7 °C	1,061 mm	96	10
2023	39.7 °C12 February 2023	-1.1 °C14 June 2023	20.6 °C	902 mm	111	1
2022	41.0 °C13 January 2022	-3.5 °C11 June 2022	18.9 °C	638 mm	87	5
2021	38.3 °C21 December 2021	-3.8 °C29 July 2021	19.2 °C	744 mm	97	7
2020	39.1 °C24 November 2020	-4.3 °C29 July 2020	19.0 °C	837 mm	96	7
2019	38.5 °C2 January 2019	-3.8 °C6 July 2019	19.0 °C	1,488 mm	71	2
2018	37.8 °C11 December 2018	-1.7 °C15 June 2018	19.3 °C	969 mm	106	4
2017	38.8 °C16 December 2017	-2.0 °C18 July 2017	19.5 °C	1,341 mm	71	3
2016	38.1 °C23 January 2016	-1.9 °C12 June 2016	18.8 °C	1,246 mm	82	2
2015	36.4 °C6 January 2015	-0.6 °C19 June 2015	19.8 °C	1,172 mm	76	2
2014	40.0 °C18 January 2014	-0.2 °C27 August 2014	19.6 °C	1,426 mm	70	2
2013	41.5 °C30 December 2013	-3.1 °C14 August 2013	19.6 °C	1,029 mm	103	3
2012	40.1 °C9 January 2012	-3.8 °C8 June 2012	19.9 °C	1,093 mm	106	7
2011	40.3 °C21 December 2011	-3.4 °C4 July 2011	18.9 °C	939 mm	88	6
2010	37.0 °C7 November 2010	-1.3 °C23 July 2010	18.7 °C	1,096 mm	81	4
2009	40.1 °C30 October 2009	-2.7 °C24 July 2009	19.5 °C	1,102 mm	98	6
2008	38.5 °C8 December 2008	-4.3 °C30 May 2008	19.7 °C	498 mm	118	4
2007	36.4 °C21 December 2007	-4.6 °C11 July 2007	18.3 °C	1,167 mm	84	6
2006	39.5 °C9 January 2006	-1.7 °C31 July 2006	19.6 °C	949 mm	101	2
2005	38.2 °C14 January 2005	-1.1 °C19 July 2005	18.7 °C	1,312 mm	70	2
2004	38.7 °C4 September 2004	-2.1 °C11 July 2004	19.1 °C	969 mm	90	2
2003	38.0 °C2 February 2003	-1.2 °C11 July 2003	18.9 °C	1,495 mm	74	3
2002	37.5 °C27 February 2002	-1.9 °C2 September 2002	19.1 °C	1,799 mm	72	4
2001	38.0 °C6 January 2001	-1.3 °C28 July 2001	19.4 °C	1,401 mm	81	4
2000	37.1 °C26 December 2000	-3.4 °C13 July 2000	18.5 °C	1,483 mm	76	4
1999	37.3 °C7 March 1999	-2.5 °C15 August 1999	18.7 °C	1,099 mm	86	4
1998	37.1 °C27 December 1998	1.3 °C21 September 1998	18.5 °C	1,374 mm	49	0
1997	37.9 °C27 October 1997	-0.6 °C28 June 1997	20.0 °C	1,069 mm	95	2
1996	38.0 °C30 December 1996	-2.4 °C29 June 1996	19.2 °C	1,105 mm	86	3
1995	38.6 °C16 December 1995	-0.6 °C20 July 1995	18.8 °C	781 mm	80	2
1994	37.4 °C20 January 1994	-2.8 °C10 July 1994	19.3 °C	1,093 mm	79	2
1993	36.9 °C24 January 1993	-2.6 °C1 August 1993	18.4 °C	1,591 mm	71	5
1992	36.1 °C8 February 1992	-1.5 °C16 July 1992	18.2 °C	1,287 mm	70	6
1991	37.6 °C20 January 1991	-3.9 °C3 August 1991	18.8 °C	1,391 mm	71	6
1990	38.8 °C27 January 1990	-3.1 °C22 July 1990	18.7 °C	1,895 mm	53	4
1989	38.8 °C4 January 1989	-2.4 °C6 July 1989	18.9 °C	1,062 mm	89	4
1988	38.4 °C4 January 1988	-3.0 °C12 July 1988	18.3 °C	1,086 mm	90	8
1987	38.3 °C25 February 1987	-2.0 °C15 June 1987	18.6 °C	1,177 mm	71	3
1986	39.3 °C25 January 1986	0.9 °C18 August 1986	19.4 °C	1,669 mm	73	0
1985	37.3 °C4 January 1985	-1.7 °C6 July 1985	19.1 °C	1,379 mm	78	2
1984	37.6 °C5 January 1984	-1.7 °C27 June 1984	18.4 °C	1,420 mm	60	4
1983	37.9 °C27 December 1983	-2.0 °C5 June 1983	18.4 °C	1,216 mm	79	3
1982	37.2 °C30 December 1982	0.0 °C29 June 1982	19.2 °C	1,203 mm	71	0
1981	35.8 °C30 October 1981	-3.1 °C18 June 1981	19.0 °C	1,106 mm	70	3
1980	39.6 °C22 January 1980	-3.1 °C2 July 1980	19.3 °C	1,207 mm	99	8
1979	37.9 °C4 February 1979	-1.7 °C20 July 1979	18.5 °C	1,039 mm	63	4
1978	36.3 °C1 December 1978	-3.3 °C9 June 1978	18.4 °C	1,468 mm	67	3
1977	36.0 °C18 November 1977	-1.0 °C25 June 1977	18.9 °C	1,556 mm	76	1
1976	35.8 °C18 January 1976	-5.4 °C10 July 1976	18.1 °C	1,073 mm	60	4
1975	39.5 °C14 February 1975	-2.1 °C17 July 1975	18.3 °C	1,199 mm	67	6
1974	36.7 °C2 January 1974	-1.7 °C13 June 1974	18.2 °C	1,224 mm	53	7
1973	40.9 °C12 January 1973	-1.7 °C18 July 1973	18.4 °C	1,526 mm	56	3
1972	38.9 °C11 January 1972	-1.2 °C4 August 1972	18.7 °C	1,189 mm	72	1
1971	40.8 °C18 December 1971	-2.4 °C16 June 1971	18.7 °C	1,150 mm	80	4
1970	38.5 °C2 January 1970	-1.6 °C24 June 1970	19.1 °C	1,277 mm	88	3
1969	37.3 °C17 December 1969	-3.3 °C19 June 1969	19.5 °C	1,082 mm	93	3
1968	40.8 °C11 December 1968	1.2 °C17 May 1968	18.7 °C	1,493 mm	70	0
1967	38.1 °C27 December 1967	-2.9 °C14 June 1967	18.9 °C	1,641 mm	80	2
1966	37.1 °C3 November 1966	-1.4 °C5 August 1966	18.8 °C	970 mm	66	3
1965	38.0 °C26 January 1965	-3.2 °C11 July 1965	19.0 °C	914 mm	87	3
1964	37.9 °C25 January 1964	-1.4 °C2 August 1964	18.3 °C	931 mm	62	2
1963	41.1 °C2 January 1963	-0.6 °C5 August 1963	19.0 °C	1,354 mm	63	2
1962	39.5 °C29 December 1962	-1.5 °C25 July 1962	18.8 °C	625 mm	104	4
1961	37.5 °C20 January 1961	-2.1 °C15 June 1961	19.3 °C	787 mm	71	3
1960	36.8 °C24 February 1960	-3.4 °C8 July 1960	18.8 °C	999 mm	84	3
1959	36.1 °C4 February 1959	1.2 °C23 June 1959	18.6 °C	1,346 mm	57	0
1958	39.7 °C13 February 1958	0.6 °C29 August 1958	18.9 °C	1,151 mm	55	0
1957	37.6 °C3 January 1957	-1.7 °C21 July 1957	19.0 °C	1,333 mm	83	4
1956	37.6 °C27 December 1956	-0.3 °C11 June 1956	18.8 °C	1,163 mm	60	1
1955	38.7 °C5 January 1955	-1.5 °C30 July 1955	18.7 °C	1,209 mm	68	1
1954	37.3 °C8 December 1954	2.4 °C7 August 1954	19.0 °C	1,089 mm	69	0
1953	36.9 °C26 December 1953	2.6 °C30 July 1953	19.6 °C	1,316 mm	58	0
1952	38.7 °C27 December 1952	1.8 °C15 June 1952	19.5 °C	1,087 mm	87	0
1951	36.6 °C15 January 1951	2.1 °C27 June 1951	19.8 °C	1,440 mm	61	0
1950	39.2 °C29 January 1950	1.1 °C31 July 1950	19.8 °C	747 mm	100	0
1949	38.7 °C25 February 1949	1.3 °C15 August 1949	19.5 °C	934 mm	90	0
1948	37.7 °C18 February 1948	1.5 °C28 July 1948	19.6 °C	1,215 mm	76	0
1947	37.8 °C23 January 1947	-1.3 °C10 July 1947	19.9 °C	902 mm	89	1
1946	41.1 °C18 January 1946	1.5 °C19 July 1946	19.7 °C	1,206 mm	81	0
1945	40.4 °C25 December 1945	-1.4 °C23 June 1945	20.5 °C	654 mm	123	3
1944	37.0 °C22 December 1944	-0.4 °C26 June 1944	20.1 °C	1,377 mm	81	2
1943	41.4 °C17 January 1943	1.6 °C6 July 1943	21.2 °C	750 mm	127	0
1942	35.1 °C12 January 1942	-0.8 °C16 June 1942	19.0 °C	902 mm	83	4
1941	36.7 °C15 February 1941	1.6 °C27 June 1941	19.3 °C	875 mm	71	0
1940	35.5 °C19 December 1940	1.7 °C1 July 1940	19.0 °C	1,232 mm	80	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

25.9 °C

+1.3 °C

Hot days (≥ 30 °C)

110 d/yr

+30

Frost days (< 0 °C)

5 d/yr

Annual rainfall

960 mm

-200 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	33.5 °C	+2.2 °C	34 mm	-102 mm
Feb	34.8 °C	+4.5 °C	58 mm	-60 mm
Mar	29.7 °C	+1.5 °C	91 mm	-45 mm
Apr	24.1 °C	-0.2 °C	35 mm	-79 mm
May	23.2 °C	+2.2 °C	60 mm	-13 mm
Jun	16.8 °C	-1.1 °C	20 mm	-25 mm
Jul	19.7 °C	+1.8 °C	29 mm	-14 mm
Aug	21.8 °C	+1.8 °C	161 mm	+108 mm
Sep	22.9 °C	+0.8 °C	75 mm	-10 mm
Oct	27.3 °C	+2.5 °C	67 mm	-52 mm
Nov	27.9 °C	+0.2 °C	179 mm	+55 mm
Dec	30.1 °C	-0.1 °C	152 mm	+37 mm

The year's extremes

Hottest day

40.0 °C

10 Feb 2025

Coldest day

-4.0 °C

1 Jul 2025

Wettest day

89.9 mm

31 Aug 2025

Windiest day

40.4 km/h

20 Aug 2025

Strongest gust

66.6 km/h

22 Aug 2025

Hottest feels-like

45.4 °C

24 Feb 2025

Coldest feels-like

-7.3 °C

1 Jul 2025

Sunniest day

14.0 h

16 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 San Justo?

San Justo has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 19.2 °C and it receives 1,160 mm of precipitation per year.

What is the hottest day ever recorded in San Justo?

The hottest day measured in San Justo between 1940 and 2025 was 30 December 2013, reaching 41.5 °C.

What is the coldest day in San Justo?

The coldest day measured in San Justo between 1940 and 2025 was 10 July 1976, at -5.4 °C.

Does it snow in San Justo?

Almost never: San Justo sees virtually no snow, with about 3 frost days per year.

Has the climate of San Justo warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in San Justo.

What is the wettest day in San Justo?

The wettest day measured in San Justo between 1940 and 2025 was 3 January 2019, with 212 mm of rain in 24 hours.

What was the windiest day in San Justo?

The windiest day measured in San Justo between 1940 and 2025 was 17 October 1982, with winds reaching 47.0 km/h.

What is the warmest month in San Justo?

The warmest month in San Justo is January (25.8 °C on average); the coldest is July (12.5 °C).

How much does it rain in San Justo?

San Justo receives on average 1,160 mm of precipitation per year, spread over about 92 rainy days.

Is it sunny in San Justo?

San Justo 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 San Justo?

The heaviest 24-hour snowfall measured in San Justo between 1940 and 2025 was 3 August 1951, with 0.1 cm.

Are there tropical nights in San Justo?

Yes: San Justo has on average 66 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in San Justo?

In San Justo, between 1940 and 2025, the highest apparent temperature reached 47.1 °C on 12 January 1973, and the lowest was -9.3 °C on 10 July 1976.

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