Grayson County Climate
Grayson County, Texas
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
63.6°F
Annual Precip
44.3"
Annual Snowfall
—
Extreme Heat Days
73
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
5,765
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Grayson County
Climate Verdict
Grayson County has a warm, averaging 63.6°F year-round, moderately wet with 44.3 inches of annual precipitation, significant summer heat with 73 days annually above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 43.2°F. summers are hot, with July averaging 83.0°F. The 40°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
Grayson County closely matches the Texas statewide average temperature of 65.5°F, it is also noticeably wetter, receiving 12.4 inches more precipitation than the state average, the county experiences 31.841873382675814 fewer extreme heat days than the state average.
Climate Profile
About Grayson County Weather
Temperate weather on the Red River
Grayson County features an annual average temperature of 63.6°F, keeping it warmer than the national median. It serves as a transition zone between the plains and the humid south.
Wetter and cooler than state averages
The county's 63.6°F average is slightly below the state norm of 65.5°F. However, its 44.3 inches of annual rain significantly exceeds the Texas state average of 31.9 inches.
High precipitation for North Texas
Grayson is wetter than many of its neighbors, receiving over 44 inches of rain annually. Its 73 days of extreme heat are fewer than the 100+ days seen in counties further south.
Hot summers and crisp, wet winters
Summers are hot with an 81.6°F average and 73 days reaching at least 90°F. Winters are cool and damp, averaging 45.1°F, though official annual snowfall data is currently unavailable.
Manage heavy rain and summer heat
With 44.3 inches of rain, residents should ensure proper property drainage and maintain reliable rain gear. Effective air conditioning is also needed to navigate the 73 days of extreme summer heat.
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.