Santa Clara County Climate
Santa Clara County, California
Avg Annual Temp
59.1°F
Annual Precip
21.2"
Annual Snowfall
3.6"
Extreme Heat Days
18.6875
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.