Siskiyou County Climate
Siskiyou County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.5°F
Annual Precip
22.8"
Annual Snowfall
16.4"
Extreme Heat Days
48
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
2,520
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Siskiyou County
Climate Verdict
Siskiyou County has a mild, with an average annual temperature of 51.5°F, semi-arid conditions with only 22.8 inches of annual precipitation, occasional hot days — 47.93333333333333 per year above 90°F, light snow averaging 16.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 35.8°F. summers are warm — July averages 71.2°F. The 35°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Siskiyou County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Siskiyou County is 7.2°F cooler than the California statewide average of 58.7°F, it is somewhat drier than average for California.
Climate Profile
About Siskiyou County Weather
California's Rugged Northern Frontier
Siskiyou averages 51.5°F, making it significantly cooler than the national median. This reflects its high-latitude position near the Oregon border.
Deep Below the State Temperature Average
The county is 7.2 degrees cooler than the California state average of 58.7°F. It represents the colder, more mountainous side of the Golden State's climate.
Drier and Colder Than Its Neighbors
Siskiyou receives 22.8 inches of rain, which is less than half the amount Shasta receives. However, it still records 16.4 inches of snow, identifying it as a true alpine environment.
Freezing Winters and Intense Heat Days
Winters are harsh for California, averaging just 36.5°F with significant snow. Paradoxically, the county also sees 48 days of extreme heat with a July average of 71.2°F.
Winter Wood Stoves and Summer Cooling
Heating systems must be robust to handle the 36.5°F winter average and 16.4 inches of snow. Prepare for a true four-season cycle that includes nearly 50 days of extreme heat.
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.