Santa Rosa climate — normals and trends
Santa Rosa (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.9 °C and it receives 689 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 (23.9 °C on average) and the coldest is July (7.9 °C). Rainfall peaks in March.
Santa Rosa averages 14 frost days, 53 hot days (≥ 30 °C) and 84 rainy days per year.
No statistically significant temperature trend emerges for Santa Rosa between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 41.1 °C (on 21 January 1980) and the coldest -8.2 °C (on 14 June 1979).
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
Santa RosaLa Pampa
- coords
- -36.62°, -64.29°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.9°C
Average daily high
21.9°C
Average daily low
10.7°C
Annual rainfall
689mm
Sunshine / day
9.9h
Mean relative humidity
65%
Average peak wind
16.9km/h
Seasonal range
16.0°C
Frost days (< 0 °C)
14 d/yr
Hot days (≥ 30 °C)
53 d/yr
Rainy days (≥ 1 mm)
84 d/yr
Annual snowfall
0.1 cm
Average feels-like high
20.9 °C
Average feels-like low
8.5 °C
Average peak gust
35.1 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
17.8 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.
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
41.1 °C
21 January 1980
Coldest day
-8.2 °C
14 June 1979
Wettest day
114 mm
29 January 1991
Windiest day
51.5 km/h
19 April 1976
Strongest gust
98.6 km/h
19 April 1976
Hottest feels-like
43.9 °C
6 February 2024
Coldest feels-like
-12.6 °C
4 August 1972
Snowiest day
2.7 cm
20 June 1977
Sunniest day
14.4 h
29 December 1950
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 | 32.9 °C | +2.7 °C | 31 mm | -47 mm |
| Feb | 30.4 °C | +1.4 °C | 91 mm | +16 mm |
| Mar | 24.6 °C | -1.3 °C | 260 mm | +173 mm |
| Apr | 20.0 °C | -1.5 °C | 45 mm | -17 mm |
| May | 18.9 °C | +1.6 °C | 16 mm | -15 mm |
| Jun | 14.5 °C | +0.7 °C | 3 mm | -19 mm |
| Jul | 13.8 °C | +0.3 °C | 6 mm | -18 mm |
| Aug | 16.7 °C | +0.7 °C | 64 mm | +38 mm |
| Sep | 20.5 °C | +1.7 °C | 90 mm | +38 mm |
| Oct | 23.6 °C | +1.7 °C | 53 mm | -27 mm |
| Nov | 26.4 °C | +0.7 °C | 76 mm | -6 mm |
| Dec | 31.8 °C | +2.9 °C | 13 mm | -61 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 Santa Rosa?
Santa Rosa has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.9 °C and it receives 689 mm of precipitation per year.
What is the hottest day ever recorded in Santa Rosa?
The hottest day measured in Santa Rosa between 1940 and 2025 was 21 January 1980, reaching 41.1 °C.
What is the coldest day in Santa Rosa?
The coldest day measured in Santa Rosa between 1940 and 2025 was 14 June 1979, at -8.2 °C.
Does it snow in Santa Rosa?
Almost never: Santa Rosa sees virtually no snow, with about 14 frost days per year.
Has the climate of Santa Rosa warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Santa Rosa.
What is the wettest day in Santa Rosa?
The wettest day measured in Santa Rosa between 1940 and 2025 was 29 January 1991, with 114 mm of rain in 24 hours.
What was the windiest day in Santa Rosa?
The windiest day measured in Santa Rosa between 1940 and 2025 was 19 April 1976, with winds reaching 51.5 km/h.
What is the warmest month in Santa Rosa?
The warmest month in Santa Rosa is January (23.9 °C on average); the coldest is July (7.9 °C).
How much does it rain in Santa Rosa?
Santa Rosa receives on average 689 mm of precipitation per year, spread over about 84 rainy days.
Is it sunny in Santa Rosa?
Santa Rosa gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.
What is the biggest single-day snowfall in Santa Rosa?
The heaviest 24-hour snowfall measured in Santa Rosa between 1940 and 2025 was 20 June 1977, with 2.7 cm.
Are there tropical nights in Santa Rosa?
Yes: Santa Rosa has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Santa Rosa?
In Santa Rosa, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 6 February 2024, and the lowest was -12.6 °C on 4 August 1972.
Compare Santa Rosa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Santa Rosa