Williamson County Climate
Williamson County, Texas
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
67.3°F
Annual Precip
35.9"
Annual Snowfall
0.0"
Extreme Heat Days
113
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9a
Minimum winter temperature range for plant survival
6,739
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Williamson County
Climate Verdict
Williamson County has a warm, averaging 67.3°F year-round, moderate rainfall of 35.9 inches per year, significant summer heat with 112.56666666666666 days annually above 90°F, light snow averaging 0.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 48.8°F. summers are hot, with July averaging 84.2°F. The 35°F seasonal variation provides noticeable but manageable change. January 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
Williamson County closely matches the Texas statewide average temperature of 65.5°F, it is somewhat wetter than average for Texas.
Climate Profile
About Williamson County Weather
Warmer than most of the nation
Williamson County maintains an annual average temperature of 67.3°F, significantly higher than the national median. This humid subtropical climate sees nearly 36 inches of rainfall each year, keeping the landscape greener than its western neighbors.
Exceeding the Texas average
The county's average temperature sits nearly two degrees above the Texas state average of 65.5°F. While not the hottest in the state, it ranks among the warmer central regions, driven by intense summer heat.
A central Texas climate hub
Williamson County shares a similar profile with neighboring Travis County but experiences slightly more rain than counties further west. Its 35.9 inches of annual precipitation is four inches higher than the state average.
Long summers and mild winters
The county endures 113 extreme heat days annually where temperatures top 90°F. Winters are manageable with a January average of 48.8°F and effectively zero annual snowfall.
Prepare for the heat dome
Residents should prioritize high-efficiency HVAC systems to handle three months of summer highs averaging over 83°F. Outdoor activities are best scheduled for the mild 50.6°F winter window.
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.