San Martin climate — normals and trends
San Martin (Argentina) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 17.7 °C and it receives 317 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 (26.0 °C on average) and the coldest is July (8.5 °C). Rainfall peaks in January.
San Martin averages 8 frost days, 92 hot days (≥ 30 °C) and 59 rainy days per year.
San Martin has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 43.9 °C (on 30 January 2003) and the coldest -6.7 °C (on 7 July 1960).
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 MartinMendoza
- coords
- -33.08°, -68.47°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.7°C
Average daily high
23.9°C
Average daily low
12.2°C
Annual rainfall
317mm
Sunshine / day
10.6h
Mean relative humidity
55%
Average peak wind
18.3km/h
Seasonal range
17.5°C
Frost days (< 0 °C)
8 d/yr
Hot days (≥ 30 °C)
92 d/yr
Rainy days (≥ 1 mm)
59 d/yr
Annual snowfall
0.7 cm
Average feels-like high
22.5 °C
Average feels-like low
10.0 °C
Average peak gust
32.2 km/h
Tropical nights (≥ 20 °C)
47 d/yr
Solar radiation
18.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.39 · p = < 0.001
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
43.9 °C
30 January 2003
Coldest day
-6.7 °C
7 July 1960
Wettest day
65 mm
25 January 1944
Windiest day
52.5 km/h
24 December 2019
Strongest gust
91.1 km/h
24 December 2019
Hottest feels-like
44.3 °C
9 February 2001
Coldest feels-like
-11.1 °C
7 July 1960
Snowiest day
4.6 cm
30 August 2005
Sunniest day
14.2 h
21 December 1940
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?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 35.7 °C | +3.5 °C | 16 mm | -42 mm |
| Feb | 36.1 °C | +5.4 °C | 19 mm | -27 mm |
| Mar | 27.7 °C | +0.2 °C | 69 mm | +28 mm |
| Apr | 23.5 °C | +0.5 °C | 2 mm | -18 mm |
| May | 21.2 °C | +2.8 °C | 11 mm | -3 mm |
| Jun | 15.9 °C | +1.1 °C | 4 mm | -4 mm |
| Jul | 16.0 °C | +1.3 °C | 2 mm | -6 mm |
| Aug | 19.3 °C | +1.4 °C | 59 mm | +50 mm |
| Sep | 24.2 °C | +2.9 °C | 2 mm | -14 mm |
| Oct | 28.8 °C | +3.4 °C | 3 mm | -20 mm |
| Nov | 31.4 °C | +2.2 °C | 28 mm | -5 mm |
| Dec | 33.3 °C | +1.4 °C | 75 mm | +33 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of San Martin?
San Martin has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 17.7 °C and it receives 317 mm of precipitation per year.
What is the hottest day ever recorded in San Martin?
The hottest day measured in San Martin between 1940 and 2025 was 30 January 2003, reaching 43.9 °C.
What is the coldest day in San Martin?
The coldest day measured in San Martin between 1940 and 2025 was 7 July 1960, at -6.7 °C.
Does it snow in San Martin?
Almost never: San Martin sees virtually no snow, with about 8 frost days per year.
Has the climate of San Martin warmed?
Yes: San Martin warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Martin?
The wettest day measured in San Martin between 1940 and 2025 was 25 January 1944, with 65 mm of rain in 24 hours.
What was the windiest day in San Martin?
The windiest day measured in San Martin between 1940 and 2025 was 24 December 2019, with winds reaching 52.5 km/h.
What is the warmest month in San Martin?
The warmest month in San Martin is January (26.0 °C on average); the coldest is July (8.5 °C).
How much does it rain in San Martin?
San Martin receives on average 317 mm of precipitation per year, spread over about 59 rainy days.
Is it sunny in San Martin?
San Martin gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Martin?
The heaviest 24-hour snowfall measured in San Martin between 1940 and 2025 was 30 August 2005, with 4.6 cm.
Are there tropical nights in San Martin?
Yes: San Martin has on average 47 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Martin?
In San Martin, between 1940 and 2025, the highest apparent temperature reached 44.3 °C on 9 February 2001, and the lowest was -11.1 °C on 7 July 1960.
Compare San Martin with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Martin