Grayson County Climate
Grayson County, Texas
Avg Annual Temp
63.6°F
Annual Precip
44.3"
Annual Snowfall
—
Extreme Heat Days
73
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.