Lassen County Climate
Lassen County, California
Avg Annual Temp
50.3°F
Annual Precip
12.9"
Annual Snowfall
21.1"
Extreme Heat Days
30.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lassen County Weather
Cooler mountain air and high-desert vibes
Lassen County averages 50.3°F annually, which is notably cooler than the national median. This high-altitude climate defines the region as one of the crisper environments in the American West.
One of California's coolest counties
Lassen stands out as a cold pocket in the Golden State, with its 50.3°F average trailing the state median of 58.7°F by over eight degrees. It offers a starkly different climate experience than the coastal or valley regions.
Dry winters with heavy snow
Lassen receives only 12.9 inches of total precipitation, less than half the state average of 25.8 inches. However, much of that falls as snow, with 21.1 inches piling up annually compared to the near-zero totals in neighboring lowlands.
Brief summers and freezing winters
Winter temperatures average a chilly 34.3°F, while the summer peak in July hits a comfortable 70.0°F. The county sees 31 days of extreme heat per year, providing a balanced but distinctly four-season cycle.
Invest in winter gear and insulation
Residents need high-quality heating systems and snow removal equipment to manage the 21 inches of annual snowfall. Outdoor planning should focus on the temperate summer window when temperatures rarely become oppressive.
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.