Ripon climate — normals and trends
Ripon (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 16.6 °C and it receives 453 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 (24.8 °C on average) and the coldest is January (8.4 °C). Rainfall peaks in January.
Ripon averages 8 frost days, 98 hot days (≥ 30 °C) and 50 rainy days per year.
Ripon has warmed by +2.1 °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 3 per year over the period.
The hottest day of the period reached 43.6 °C (on 14 July 1972) and the coldest -6.6 °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
RiponCalifornia
- coords
- 37.74°, -121.12°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.6°C
Average daily high
23.4°C
Average daily low
10.6°C
Annual rainfall
453mm
Sunshine / day
10.8h
Mean relative humidity
61%
Average peak wind
14.2km/h
Seasonal range
16.4°C
Frost days (< 0 °C)
8 d/yr
Hot days (≥ 30 °C)
98 d/yr
Rainy days (≥ 1 mm)
50 d/yr
Annual snowfall
0.1 cm
Average feels-like high
22.7 °C
Average feels-like low
8.7 °C
Average peak gust
29.7 km/h
Tropical nights (≥ 20 °C)
9 d/yr
Solar radiation
19.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.62 · 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
43.6 °C
14 July 1972
Coldest day
-6.6 °C
22 December 1990
Wettest day
62 mm
9 February 1962
Windiest day
47.0 km/h
4 February 2024
Strongest gust
97.2 km/h
20 January 2010
Hottest feels-like
45.5 °C
21 July 1960
Coldest feels-like
-11.2 °C
22 December 1990
Snowiest day
2.3 cm
27 December 1988
Sunniest day
14.1 h
22 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 | 15.7 °C | +2.1 °C | 18 mm | -67 mm |
| Feb | 17.7 °C | +1.5 °C | 100 mm | +22 mm |
| Mar | 19.4 °C | +0.8 °C | 68 mm | -4 mm |
| Apr | 24.8 °C | +2.6 °C | 9 mm | -27 mm |
| May | 30.3 °C | +3.5 °C | 1 mm | -15 mm |
| Jun | 33.0 °C | +2.1 °C | 0 mm | -3 mm |
| Jul | 33.5 °C | +0.1 °C | 0 mm | -1 mm |
| Aug | 34.2 °C | +1.8 °C | 0 mm | -1 mm |
| Sep | 31.3 °C | +1.1 °C | 2 mm | -2 mm |
| Oct | 24.0 °C | -0.9 °C | 42 mm | +19 mm |
| Nov | 18.2 °C | +0.1 °C | 106 mm | +52 mm |
| Dec | 13.5 °C | -0.2 °C | 73 mm | -5 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 Ripon?
Ripon has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 16.6 °C and it receives 453 mm of precipitation per year.
What is the hottest day ever recorded in Ripon?
The hottest day measured in Ripon between 1940 and 2025 was 14 July 1972, reaching 43.6 °C.
What is the coldest day in Ripon?
The coldest day measured in Ripon between 1940 and 2025 was 22 December 1990, at -6.6 °C.
Does it snow in Ripon?
Almost never: Ripon sees virtually no snow, with about 8 frost days per year.
Has the climate of Ripon warmed?
Yes: Ripon warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ripon?
The wettest day measured in Ripon between 1940 and 2025 was 9 February 1962, with 62 mm of rain in 24 hours.
What was the windiest day in Ripon?
The windiest day measured in Ripon between 1940 and 2025 was 4 February 2024, with winds reaching 47.0 km/h.
What is the warmest month in Ripon?
The warmest month in Ripon is July (24.8 °C on average); the coldest is January (8.4 °C).
How much does it rain in Ripon?
Ripon receives on average 453 mm of precipitation per year, spread over about 50 rainy days.
Is it sunny in Ripon?
Ripon gets on average 10.8 hours of sunshine per day, roughly 3,942 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ripon?
The heaviest 24-hour snowfall measured in Ripon between 1940 and 2025 was 27 December 1988, with 2.3 cm.
Are there tropical nights in Ripon?
Yes: Ripon has on average 9 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ripon?
In Ripon, between 1940 and 2025, the highest apparent temperature reached 45.5 °C on 21 July 1960, and the lowest was -11.2 °C on 22 December 1990.
Compare Ripon with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ripon