San Bernardino County Climate
San Bernardino County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
64.8°F
Annual Precip
9.7"
Annual Snowfall
10.4"
Extreme Heat Days
111
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
10a
Minimum winter temperature range for plant survival
6,007
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: San Bernardino County
Climate Verdict
San Bernardino County has a warm, averaging 64.8°F year-round, arid conditions receiving just 9.7 inches of precipitation annually, significant summer heat with 110.89444444444445 days annually above 90°F, light snow averaging 10.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 48.4°F. summers are hot, with July averaging 83.9°F. The 35°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
San Bernardino County is 6.2°F warmer than the California statewide average of 58.7°F, it is also noticeably drier, receiving 16.0 inches less precipitation than the state average, the county experiences 52.22351948151057 more extreme heat days than the state average.
Climate Profile
About San Bernardino County Weather
A massive county with high heat
San Bernardino County averages 64.8°F, placing it well above the national median temperature. It is a dry region, receiving less than 10 inches of annual precipitation.
Warmer than the California average
The county's average of 64.8°F outpaces the state average of 58.7°F by several degrees. However, it is slightly cooler on average than its neighbor, Riverside County.
Drier than coastal counterparts
The county receives just 9.7 inches of rain, which is much lower than San Diego's 14 inches. Despite the heat, it averages 10.4 inches of snow annually due to its high-altitude mountain ranges.
Intense heat and mountain snow
With 111 extreme heat days a year, summers are demanding as July averages 83.9°F. Winter brings a sharp contrast, featuring a 48.4°F January average and significant mountain snowfall.
Manage heat and mountain winter
Residents need high-efficiency cooling for the 111 days of extreme heat. Those in higher elevations must also maintain snow removal equipment and winter vehicle kits.
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.