South Yuba City climate — normals and trends
South Yuba City (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.6 °C and it receives 541 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 (26.5 °C on average) and the coldest is January (8.9 °C). Rainfall peaks in January.
South Yuba City averages 5 frost days, 124 hot days (≥ 30 °C) and 57 rainy days per year.
South Yuba City has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 8 to 2 per year over the period.
The hottest day of the period reached 48.7 °C (on 14 July 1972) and the coldest -6.2 °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
South Yuba CityCalifornia
- coords
- 39.12°, -121.64°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.6°C
Average daily high
24.6°C
Average daily low
11.4°C
Annual rainfall
541mm
Sunshine / day
10.5h
Mean relative humidity
56%
Average peak wind
14.5km/h
Seasonal range
17.6°C
Frost days (< 0 °C)
5 d/yr
Hot days (≥ 30 °C)
124 d/yr
Rainy days (≥ 1 mm)
57 d/yr
Annual snowfall
0.4 cm
Average feels-like high
23.3 °C
Average feels-like low
9.5 °C
Average peak gust
31.2 km/h
Tropical nights (≥ 20 °C)
20 d/yr
Solar radiation
18.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.66 · 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
48.7 °C
14 July 1972
Coldest day
-6.2 °C
22 December 1990
Wettest day
111 mm
13 October 1962
Windiest day
51.4 km/h
4 January 2008
Strongest gust
110.9 km/h
20 January 2010
Hottest feels-like
48.6 °C
6 August 1978
Coldest feels-like
-11.0 °C
22 December 1990
Snowiest day
4.4 cm
4 January 1974
Sunniest day
14.3 h
24 June 2016
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 | 16.8 °C | +2.9 °C | 27 mm | -79 mm |
| Feb | 17.5 °C | +0.9 °C | 174 mm | +83 mm |
| Mar | 19.5 °C | +0.4 °C | 71 mm | -9 mm |
| Apr | 25.8 °C | +2.4 °C | 14 mm | -25 mm |
| May | 32.1 °C | +3.6 °C | 3 mm | -15 mm |
| Jun | 35.6 °C | +2.4 °C | 0 mm | -5 mm |
| Jul | 35.9 °C | +0.1 °C | 0 mm | -0 mm |
| Aug | 37.7 °C | +3.1 °C | 0 mm | -1 mm |
| Sep | 33.1 °C | +1.1 °C | 4 mm | -1 mm |
| Oct | 25.5 °C | -0.6 °C | 42 mm | +11 mm |
| Nov | 19.7 °C | +1.2 °C | 93 mm | +22 mm |
| Dec | 13.9 °C | -0.1 °C | 109 mm | +14 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 South Yuba City?
South Yuba City has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.6 °C and it receives 541 mm of precipitation per year.
What is the hottest day ever recorded in South Yuba City?
The hottest day measured in South Yuba City between 1940 and 2025 was 14 July 1972, reaching 48.7 °C.
What is the coldest day in South Yuba City?
The coldest day measured in South Yuba City between 1940 and 2025 was 22 December 1990, at -6.2 °C.
Does it snow in South Yuba City?
Almost never: South Yuba City sees virtually no snow, with about 5 frost days per year.
Has the climate of South Yuba City warmed?
Yes: South Yuba City warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in South Yuba City?
The wettest day measured in South Yuba City between 1940 and 2025 was 13 October 1962, with 111 mm of rain in 24 hours.
What was the windiest day in South Yuba City?
The windiest day measured in South Yuba City between 1940 and 2025 was 4 January 2008, with winds reaching 51.4 km/h.
What is the warmest month in South Yuba City?
The warmest month in South Yuba City is July (26.5 °C on average); the coldest is January (8.9 °C).
How much does it rain in South Yuba City?
South Yuba City receives on average 541 mm of precipitation per year, spread over about 57 rainy days.
Is it sunny in South Yuba City?
South Yuba City gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
What is the biggest single-day snowfall in South Yuba City?
The heaviest 24-hour snowfall measured in South Yuba City between 1940 and 2025 was 4 January 1974, with 4.4 cm.
Are there tropical nights in South Yuba City?
Yes: South Yuba City has on average 20 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in South Yuba City?
In South Yuba City, between 1940 and 2025, the highest apparent temperature reached 48.6 °C on 6 August 1978, and the lowest was -11.0 °C on 22 December 1990.
Compare South Yuba City with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around South Yuba City