Perris climate — normals and trends
Perris (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.0 °C and it receives 429 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 (24.9 °C on average) and the coldest is January (10.1 °C). Rainfall peaks in February.
Perris averages 6 frost days, 89 hot days (≥ 30 °C) and 43 rainy days per year.
Perris has warmed by +2.2 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 13 to 0 per year over the period.
The hottest day of the period reached 46.3 °C (on 6 September 2020) and the coldest -10.6 °C (on 12 January 1949).
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
PerrisCalifornia
- coords
- 33.78°, -117.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.0°C
Average daily high
23.8°C
Average daily low
11.3°C
Annual rainfall
429mm
Sunshine / day
11.2h
Mean relative humidity
61%
Average peak wind
11.8km/h
Seasonal range
14.8°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
89 d/yr
Rainy days (≥ 1 mm)
43 d/yr
Annual snowfall
0.8 cm
Average feels-like high
23.1 °C
Average feels-like low
10.1 °C
Average peak gust
27.8 km/h
Tropical nights (≥ 20 °C)
29 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.54 · 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
46.3 °C
6 September 2020
Coldest day
-10.6 °C
12 January 1949
Wettest day
87 mm
25 January 1969
Windiest day
35.1 km/h
30 November 1982
Strongest gust
84.2 km/h
30 November 1982
Hottest feels-like
45.5 °C
6 July 2018
Coldest feels-like
-15.2 °C
12 January 1949
Snowiest day
9.9 cm
29 January 1957
Sunniest day
14.0 h
16 June 1940
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 | 18.4 °C | +1.6 °C | 22 mm | -57 mm |
| Feb | 20.4 °C | +2.9 °C | 78 mm | -11 mm |
| Mar | 18.2 °C | -0.4 °C | 93 mm | +20 mm |
| Apr | 21.8 °C | +0.5 °C | 17 mm | -19 mm |
| May | 25.9 °C | +1.8 °C | 12 mm | -1 mm |
| Jun | 29.7 °C | +1.4 °C | 3 mm | -0 mm |
| Jul | 31.1 °C | -1.1 °C | 0 mm | -2 mm |
| Aug | 33.9 °C | +1.5 °C | 1 mm | -3 mm |
| Sep | 30.1 °C | -0.4 °C | 21 mm | +12 mm |
| Oct | 26.7 °C | +0.7 °C | 32 mm | +13 mm |
| Nov | 22.6 °C | +1.6 °C | 120 mm | +79 mm |
| Dec | 21.3 °C | +4.0 °C | 75 mm | +13 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 Perris?
Perris has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.0 °C and it receives 429 mm of precipitation per year.
What is the hottest day ever recorded in Perris?
The hottest day measured in Perris between 1940 and 2025 was 6 September 2020, reaching 46.3 °C.
What is the coldest day in Perris?
The coldest day measured in Perris between 1940 and 2025 was 12 January 1949, at -10.6 °C.
Does it snow in Perris?
Almost never: Perris sees virtually no snow, with about 6 frost days per year.
Has the climate of Perris warmed?
Yes: Perris warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Perris?
The wettest day measured in Perris between 1940 and 2025 was 25 January 1969, with 87 mm of rain in 24 hours.
What was the windiest day in Perris?
The windiest day measured in Perris between 1940 and 2025 was 30 November 1982, with winds reaching 35.1 km/h.
What is the warmest month in Perris?
The warmest month in Perris is August (24.9 °C on average); the coldest is January (10.1 °C).
How much does it rain in Perris?
Perris receives on average 429 mm of precipitation per year, spread over about 43 rainy days.
Is it sunny in Perris?
Perris gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Perris?
The heaviest 24-hour snowfall measured in Perris between 1940 and 2025 was 29 January 1957, with 9.9 cm.
Are there tropical nights in Perris?
Yes: Perris has on average 29 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Perris?
In Perris, between 1940 and 2025, the highest apparent temperature reached 45.5 °C on 6 July 2018, and the lowest was -15.2 °C on 12 January 1949.
Compare Perris with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Perris