Orange County Climate
Orange County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
65.3°F
Annual Precip
12.3"
Annual Snowfall
0.0"
Extreme Heat Days
29
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
10b
Minimum winter temperature range for plant survival
5,603
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Orange County
Climate Verdict
Orange County has a warm, averaging 65.3°F year-round, arid conditions receiving just 12.3 inches of precipitation annually, occasional hot days — 28.825000000000003 per year above 90°F, virtually no measurable snowfall. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are exceptionally mild, with January averaging 57.8°F. summers are warm — July averages 73.0°F. The climate is remarkably stable year-round, with only a 15°F difference between January and July. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
The mild climate makes outdoor recreation viable nearly year-round.
Regional Context
Orange County is 6.6°F warmer than the California statewide average of 58.7°F, it is also noticeably drier, receiving 13.5 inches less precipitation than the state average, the county experiences 29.84592496293387 fewer extreme heat days than the state average.
Climate Profile
About Orange County Weather
Consistently Warm and Sunny
Orange County’s 65.3°F annual average is much higher than the national median. It offers a classic semi-arid Mediterranean climate that stays warm year-round.
One of the Warmest in California
At 65.3°F, the county is significantly warmer than the state average of 58.7°F. It is also quite dry, receiving only 12.3 inches of rain compared to the 25.8-inch state average.
Drier and Warmer Than the North
Orange County is nearly 6 degrees warmer than Napa County on average. It receives less than half the rainfall of the northern wine country, emphasizing its Southern California desert-edge nature.
Perpetual Summer
Winters are exceptionally mild with a January average of 57.8°F and zero snow. Summers bring 29 days of heat above 90°F, concentrated mostly in the inland valleys.
Protect Against the Sun
Energy-efficient cooling and sun protection are vital for the 29 annual extreme heat days. With only 12.3 inches of rain, drought-tolerant landscaping is the standard for local homeowners.
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.