Colusa County Climate
Colusa County, California
Avg Annual Temp
60.4°F
Annual Precip
20.5"
Annual Snowfall
0.6"
Extreme Heat Days
83.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Colusa County Weather
Extreme Heat in the Central Valley
Colusa County’s 60.4°F average temperature sits well above the national median. This region is characterized by hot, dry conditions typical of California's interior.
One of California's Hotter, Drier Counties
The county's 60.4°F average is warmer than the California state average of 58.7°F. With only 20.5 inches of rain, it is drier than the state average of 25.8 inches.
Drier and Hotter than Butte
Colusa is significantly drier than neighboring Butte County, receiving 27 fewer inches of rain annually. It also experiences 83 extreme heat days, compared to Butte's 72.
Relentless Summer Sun and Dry Winters
July brings an average temperature of 76.6°F and 83 days of extreme heat annually. Winters are mild and dry, with a 46.5°F average and almost zero snowfall.
Maximize Cooling for 83 Hot Days
Efficient HVAC systems are the top priority for the 83 days of extreme heat. Since snowfall is nearly non-existent, residents can focus their budget on irrigation and cooling instead.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.