Atascadero climate — normals and trends
Atascadero (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 14.6 °C and it receives 367 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 August (20.0 °C on average) and the coldest is January (9.2 °C). Rainfall peaks in February.
Atascadero averages 3 frost days, 19 hot days (≥ 30 °C) and 38 rainy days per year.
Atascadero has warmed by +1.0 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The number of frost days there went from about 6 to 0 per year over the period.
The hottest day of the period reached 38.4 °C (on 9 September 1944) and the coldest -5.5 °C (on 22 December 1990).
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
AtascaderoCalifornia
- coords
- 35.49°, -120.67°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.6°C
Average daily high
20.5°C
Average daily low
9.8°C
Annual rainfall
367mm
Sunshine / day
11.1h
Mean relative humidity
69%
Average peak wind
13.7km/h
Seasonal range
10.8°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
19 d/yr
Rainy days (≥ 1 mm)
38 d/yr
Annual snowfall
0.1 cm
Average feels-like high
19.9 °C
Average feels-like low
8.3 °C
Average peak gust
30.5 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
20.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.27 · 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
38.4 °C
9 September 1944
Coldest day
-5.5 °C
22 December 1990
Wettest day
88 mm
5 December 1997
Windiest day
46.1 km/h
9 February 1962
Strongest gust
113.0 km/h
3 February 1998
Hottest feels-like
40.7 °C
4 September 1988
Coldest feels-like
-10.0 °C
22 December 1990
Snowiest day
2.7 cm
21 January 1962
Sunniest day
14.0 h
17 May 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 | 16.3 °C | +1.8 °C | 14 mm | -60 mm |
| Feb | 16.7 °C | +1.3 °C | 65 mm | -9 mm |
| Mar | 15.9 °C | -0.8 °C | 63 mm | -4 mm |
| Apr | 18.7 °C | -0.2 °C | 9 mm | -19 mm |
| May | 22.5 °C | +1.1 °C | 0 mm | -8 mm |
| Jun | 23.1 °C | -1.2 °C | 0 mm | -2 mm |
| Jul | 22.4 °C | -4.0 °C | 0 mm | -0 mm |
| Aug | 25.9 °C | -0.6 °C | 0 mm | -1 mm |
| Sep | 24.5 °C | -1.2 °C | 13 mm | +9 mm |
| Oct | 21.3 °C | -1.4 °C | 24 mm | +11 mm |
| Nov | 18.2 °C | +0.1 °C | 67 mm | +31 mm |
| Dec | 16.5 °C | +1.7 °C | 91 mm | +31 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 Atascadero?
Atascadero has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 14.6 °C and it receives 367 mm of precipitation per year.
What is the hottest day ever recorded in Atascadero?
The hottest day measured in Atascadero between 1940 and 2025 was 9 September 1944, reaching 38.4 °C.
What is the coldest day in Atascadero?
The coldest day measured in Atascadero between 1940 and 2025 was 22 December 1990, at -5.5 °C.
Does it snow in Atascadero?
Almost never: Atascadero sees virtually no snow, with about 3 frost days per year.
Has the climate of Atascadero warmed?
Yes: Atascadero warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Atascadero?
The wettest day measured in Atascadero between 1940 and 2025 was 5 December 1997, with 88 mm of rain in 24 hours.
What was the windiest day in Atascadero?
The windiest day measured in Atascadero between 1940 and 2025 was 9 February 1962, with winds reaching 46.1 km/h.
What is the warmest month in Atascadero?
The warmest month in Atascadero is August (20.0 °C on average); the coldest is January (9.2 °C).
How much does it rain in Atascadero?
Atascadero receives on average 367 mm of precipitation per year, spread over about 38 rainy days.
Is it sunny in Atascadero?
Atascadero gets on average 11.1 hours of sunshine per day, roughly 4,052 hours per year over 1940-2025.
What is the biggest single-day snowfall in Atascadero?
The heaviest 24-hour snowfall measured in Atascadero between 1940 and 2025 was 21 January 1962, with 2.7 cm.
Are there tropical nights in Atascadero?
Yes: Atascadero has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Atascadero?
In Atascadero, between 1940 and 2025, the highest apparent temperature reached 40.7 °C on 4 September 1988, and the lowest was -10.0 °C on 22 December 1990.
Compare Atascadero with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Atascadero