Pleasanton climate — normals and trends
Pleasanton (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 14.5 °C and it receives 420 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 July (20.9 °C on average) and the coldest is January (8.0 °C). Rainfall peaks in January.
Pleasanton averages 6 frost days, 41 hot days (≥ 30 °C) and 53 rainy days per year.
Pleasanton has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 11 to 1 per year over the period.
The hottest day of the period reached 41.5 °C (on 14 July 1972) and the coldest -7.6 °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
PleasantonCalifornia
- coords
- 37.66°, -121.87°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.5°C
Average daily high
20.9°C
Average daily low
9.1°C
Annual rainfall
420mm
Sunshine / day
10.7h
Mean relative humidity
66%
Average peak wind
13.5km/h
Seasonal range
12.9°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
41 d/yr
Rainy days (≥ 1 mm)
53 d/yr
Annual snowfall
0.8 cm
Average feels-like high
19.9 °C
Average feels-like low
7.3 °C
Average peak gust
33.2 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
19.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.51 · 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
41.5 °C
14 July 1972
Coldest day
-7.6 °C
22 December 1990
Wettest day
80 mm
13 October 2009
Windiest day
41.2 km/h
3 December 1983
Strongest gust
108.4 km/h
12 December 1995
Hottest feels-like
43.0 °C
6 September 2022
Coldest feels-like
-11.5 °C
22 December 1990
Snowiest day
3.4 cm
13 March 1975
Sunniest day
14.1 h
6 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 14.6 °C | +1.9 °C | 12 mm | -67 mm |
| Feb | 15.9 °C | +1.2 °C | 96 mm | +22 mm |
| Mar | 16.9 °C | +0.3 °C | 62 mm | -4 mm |
| Apr | 20.8 °C | +1.4 °C | 14 mm | -19 mm |
| May | 24.9 °C | +2.1 °C | 2 mm | -13 mm |
| Jun | 26.3 °C | -0.1 °C | 0 mm | -4 mm |
| Jul | 27.2 °C | -1.9 °C | 0 mm | -1 mm |
| Aug | 29.2 °C | +0.5 °C | 0 mm | -1 mm |
| Sep | 27.5 °C | +0.2 °C | 4 mm | -1 mm |
| Oct | 21.8 °C | -1.1 °C | 46 mm | +24 mm |
| Nov | 17.0 °C | +0.2 °C | 78 mm | +29 mm |
| Dec | 12.9 °C | 0.0 °C | 37 mm | -35 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 Pleasanton?
Pleasanton has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 14.5 °C and it receives 420 mm of precipitation per year.
What is the hottest day ever recorded in Pleasanton?
The hottest day measured in Pleasanton between 1940 and 2025 was 14 July 1972, reaching 41.5 °C.
What is the coldest day in Pleasanton?
The coldest day measured in Pleasanton between 1940 and 2025 was 22 December 1990, at -7.6 °C.
Does it snow in Pleasanton?
Almost never: Pleasanton sees virtually no snow, with about 6 frost days per year.
Has the climate of Pleasanton warmed?
Yes: Pleasanton warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Pleasanton?
The wettest day measured in Pleasanton between 1940 and 2025 was 13 October 2009, with 80 mm of rain in 24 hours.
What was the windiest day in Pleasanton?
The windiest day measured in Pleasanton between 1940 and 2025 was 3 December 1983, with winds reaching 41.2 km/h.
What is the warmest month in Pleasanton?
The warmest month in Pleasanton is July (20.9 °C on average); the coldest is January (8.0 °C).
How much does it rain in Pleasanton?
Pleasanton receives on average 420 mm of precipitation per year, spread over about 53 rainy days.
Is it sunny in Pleasanton?
Pleasanton gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
What is the biggest single-day snowfall in Pleasanton?
The heaviest 24-hour snowfall measured in Pleasanton between 1940 and 2025 was 13 March 1975, with 3.4 cm.
Are there tropical nights in Pleasanton?
Yes: Pleasanton has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Pleasanton?
In Pleasanton, between 1940 and 2025, the highest apparent temperature reached 43.0 °C on 6 September 2022, and the lowest was -11.5 °C on 22 December 1990.
Compare Pleasanton with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Pleasanton