Berkeley climate — normals and trends
Berkeley (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 13.9 °C and it receives 458 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 September (17.8 °C on average) and the coldest is January (9.0 °C). Rainfall peaks in January.
Berkeley averages 2 frost days, 13 hot days (≥ 30 °C) and 54 rainy days per year.
Berkeley has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The number of frost days there went from about 4 to 0 per year over the period.
The hottest day of the period reached 40.8 °C (on 3 September 1950) and the coldest -5.3 °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
BerkeleyCalifornia
- coords
- 37.87°, -122.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.9°C
Average daily high
19.4°C
Average daily low
9.6°C
Annual rainfall
458mm
Sunshine / day
10.6h
Mean relative humidity
74%
Average peak wind
16.2km/h
Seasonal range
8.8°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
13 d/yr
Rainy days (≥ 1 mm)
54 d/yr
Annual snowfall
0.0 cm
Average feels-like high
18.3 °C
Average feels-like low
7.9 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
18.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.32 · 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
40.8 °C
3 September 1950
Coldest day
-5.3 °C
22 December 1990
Wettest day
86 mm
31 December 2022
Windiest day
53.9 km/h
3 December 1983
Strongest gust
114.5 km/h
23 December 1955
Hottest feels-like
41.2 °C
14 June 2000
Coldest feels-like
-9.8 °C
22 December 1990
Snowiest day
1.8 cm
13 March 1975
Sunniest day
14.2 h
2 July 2025
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 | 15.4 °C | +2.1 °C | 12 mm | -75 mm |
| Feb | 15.9 °C | +0.8 °C | 106 mm | +23 mm |
| Mar | 16.4 °C | 0.0 °C | 69 mm | -4 mm |
| Apr | 18.5 °C | 0.0 °C | 8 mm | -28 mm |
| May | 21.5 °C | +0.8 °C | 2 mm | -13 mm |
| Jun | 20.9 °C | -2.1 °C | 0 mm | -4 mm |
| Jul | 21.1 °C | -3.1 °C | 0 mm | -0 mm |
| Aug | 24.1 °C | -0.2 °C | 1 mm | -1 mm |
| Sep | 24.3 °C | -0.4 °C | 2 mm | -1 mm |
| Oct | 21.5 °C | -0.7 °C | 29 mm | +6 mm |
| Nov | 17.2 °C | +0.1 °C | 72 mm | +18 mm |
| Dec | 13.1 °C | -0.5 °C | 54 mm | -26 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 Berkeley?
Berkeley has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 13.9 °C and it receives 458 mm of precipitation per year.
What is the hottest day ever recorded in Berkeley?
The hottest day measured in Berkeley between 1940 and 2025 was 3 September 1950, reaching 40.8 °C.
What is the coldest day in Berkeley?
The coldest day measured in Berkeley between 1940 and 2025 was 22 December 1990, at -5.3 °C.
Does it snow in Berkeley?
Almost never: Berkeley sees virtually no snow, with about 2 frost days per year.
Has the climate of Berkeley warmed?
Yes: Berkeley warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Berkeley?
The wettest day measured in Berkeley between 1940 and 2025 was 31 December 2022, with 86 mm of rain in 24 hours.
What was the windiest day in Berkeley?
The windiest day measured in Berkeley between 1940 and 2025 was 3 December 1983, with winds reaching 53.9 km/h.
What is the warmest month in Berkeley?
The warmest month in Berkeley is September (17.8 °C on average); the coldest is January (9.0 °C).
How much does it rain in Berkeley?
Berkeley receives on average 458 mm of precipitation per year, spread over about 54 rainy days.
Is it sunny in Berkeley?
Berkeley 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 Berkeley?
The heaviest 24-hour snowfall measured in Berkeley between 1940 and 2025 was 13 March 1975, with 1.8 cm.
Are there tropical nights in Berkeley?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Berkeley.
What was the most extreme apparent temperature in Berkeley?
In Berkeley, between 1940 and 2025, the highest apparent temperature reached 41.2 °C on 14 June 2000, and the lowest was -9.8 °C on 22 December 1990.
Compare Berkeley with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Berkeley