Mendocino County Climate
Mendocino County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
56.4°F
Annual Precip
42.7"
Annual Snowfall
1.2"
Extreme Heat Days
54
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9b
Minimum winter temperature range for plant survival
2,981
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Mendocino County
Climate Verdict
Mendocino County has a mild, with an average annual temperature of 56.4°F, moderately wet with 42.7 inches of annual precipitation, occasional hot days — 54.38333333333333 per year above 90°F, light snow averaging 1.2 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 45.5°F. summers are pleasantly cool with July averaging 69.7°F. The climate is remarkably stable year-round, with only a 24°F difference between January and July. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Mendocino County closely matches the California statewide average temperature of 58.7°F, it is also noticeably wetter, receiving 17.0 inches more precipitation than the state average.
Climate Profile
About Mendocino County Weather
Comfortable and temperate coastal air
Mendocino County's 56.4°F annual average is slightly higher than the national median. It offers a stable, maritime-influenced climate that avoids the harshness of continental weather.
Slightly cooler than the state average
Mendocino's 56.4°F average is just below the California state average of 58.7°F. This makes it a temperate middle ground between the cold north and the hot south.
One of California's wettest regions
The county receives 42.7 inches of annual precipitation, dwarfing the state average of 25.8 inches. This heavy rainfall is paired with minimal snowfall, averaging only 1.2 inches per year.
Fifty-four days of summer heat
The July average reaches 69.7°F, but the county still experiences 54 days of extreme heat over 90°F. Winter remains mild with an average of 45.9°F, providing a relatively narrow temperature range.
Invest in serious rain gear
The 42.7 inches of annual rain define the lifestyle here, making waterproof clothing and sturdy roofing essential. Residents should also be prepared for the 54 days of extreme heat that occur mostly inland.
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.