Santa Clara County Climate
Santa Clara County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
59.1°F
Annual Precip
21.2"
Annual Snowfall
3.6"
Extreme Heat Days
19
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9b
Minimum winter temperature range for plant survival
3,701
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Santa Clara County
Climate Verdict
Santa Clara County has a mild, with an average annual temperature of 59.1°F, semi-arid conditions with only 21.2 inches of annual precipitation, rare extreme heat with only 18.6875 days above 90°F annually, light snow averaging 3.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 49.0°F. summers are pleasantly cool with July averaging 69.7°F. The climate is remarkably stable year-round, with only a 21°F difference between January and July. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Santa Clara County closely matches the California statewide average temperature of 58.7°F, it is somewhat drier than average for California, the county experiences 39.983424962933874 fewer extreme heat days than the state average.
Climate Profile
About Santa Clara County Weather
The Ideal Temperate Valley Environment
Santa Clara averages 59.1°F, exceeding the national median and providing a reliably warm climate. This environment supports both the region's historical orchards and its modern tech hubs.
Matching the California Average Perfectly
The county's 59.1°F annual average is nearly identical to the California state average of 58.7°F. It serves as a benchmark for the state's most populated coastal-adjacent regions.
A Drier Choice in the Bay Area
With only 21.2 inches of annual precipitation, Santa Clara is drier than San Mateo and Santa Cruz. It uniquely records 3.6 inches of snowfall in its higher elevations, unlike its immediate coastal neighbors.
Warm Summers and Crisp Winter Nights
July averages nearly 70°F, accompanied by 19 days of extreme heat over 90°F. Winter temperatures average 49.4°F, making it slightly cooler than the adjacent San Mateo County.
HVAC Readiness for Summer Heat
Energy-efficient cooling is important for the 19 days of high heat throughout the summer. Homeowners should also plan for occasional winter frosts when temperatures dip toward the 49°F average.
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.