Colusa County Climate
Colusa County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
60.4°F
Annual Precip
20.5"
Annual Snowfall
0.6"
Extreme Heat Days
83
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9b
Minimum winter temperature range for plant survival
4,310
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Colusa County
Climate Verdict
Colusa County has a warm, averaging 60.4°F year-round, semi-arid conditions with only 20.5 inches of annual precipitation, significant summer heat with 83.3 days annually above 90°F, light snow averaging 0.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 45.4°F. summers are warm — July averages 76.6°F. The 31°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Colusa County closely matches the California statewide average temperature of 58.7°F, it is also noticeably drier, receiving 5.3 inches less precipitation than the state average, the county experiences 24.629075037066123 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.