Riverside County Climate
Riverside County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
69.5°F
Annual Precip
7.9"
Annual Snowfall
2.1"
Extreme Heat Days
140
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
10a
Minimum winter temperature range for plant survival
7,273
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Riverside County
Climate Verdict
Riverside County has a warm, averaging 69.5°F year-round, arid conditions receiving just 7.9 inches of precipitation annually, extreme heat exposure with 139.82777777777778 days per year above 90°F, light snow averaging 2.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are exceptionally mild, with January averaging 55.1°F. summers are hot, with July averaging 86.0°F. The 31°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Riverside County is 10.9°F warmer than the California statewide average of 58.7°F, it is also noticeably drier, receiving 17.8 inches less precipitation than the state average, the county experiences 81.15685281484392 more extreme heat days than the state average.
Climate Profile
About Riverside County Weather
A blistering desert pace for Riverside
Riverside County averages a warm 69.5°F annually, significantly exceeding the national median temperature. With only 7.9 inches of rain, the climate remains much drier and hotter than most of the United States.
Riverside leads the state in heat
The county's 69.5°F annual average sits well above California's state average of 58.7°F. This makes it one of the warmest regions in the state, driven by its vast inland desert landscapes.
Hotter and drier than its neighbors
Riverside is notably warmer than San Bernardino County, which averages 64.8°F. It also receives about 6 inches less annual rainfall than neighboring San Diego County, emphasizing its arid inland profile.
Extreme summers and mild winters
The county faces an intense 140 days per year where temperatures exceed 90°F. While July averages 86.0°F, winters remain mild with a January average of 55.1°F and negligible snowfall of 2.1 inches.
Prioritize cooling and desert readiness
Robust HVAC systems are a necessity here to manage the frequent triple-digit summer days. Residents should also plan for high water conservation given the low 7.9-inch annual precipitation.
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.