King William County Climate
King William County, Virginia
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
59.1°F
Annual Precip
47.9"
Annual Snowfall
9.6"
Extreme Heat Days
50
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,559
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: King William County
Climate Verdict
King William County has a mild, with an average annual temperature of 59.1°F, moderately wet with 47.9 inches of annual precipitation, occasional hot days — 50 per year above 90°F, light snow averaging 9.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 38.7°F. summers are warm — July averages 79.2°F. The 41°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
King William County closely matches the Virginia statewide average temperature of 56.2°F, the county experiences 22.219535519125706 more extreme heat days than the state average.
Climate Profile
About King William County Weather
A Warmer-than-Average Mid-Atlantic Climate
King William County averages 59.1°F annually, which is notably higher than the national median. It also receives a healthy 47.9 inches of precipitation.
Warmer and Wetter Than the State Average
The county is 3.2 degrees warmer than the Virginia average of 55.9°F. It also receives about 2.2 inches more rain annually than the state as a whole.
Warmer Than Henrico and Hanover
King William is nearly a full degree warmer than Henrico County and over a degree warmer than Hanover. It shares a similar high-heat profile with Hopewell.
Fifty Days of Extreme Summer Heat
Summer is intense with 50 days reaching 90°F or higher and a July average of 79.2°F. Winters are mild, averaging 9.6 inches of snow.
Manage High Humidity and Summer Peaks
Residents should budget for high cooling costs to handle the 50 days of extreme heat. Rain-ready gear is also essential given the 47.9 inches of 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.