Collin County Climate
Collin County, Texas
Avg Annual Temp
65.0°F
Annual Precip
40.5"
Annual Snowfall
1.4"
Extreme Heat Days
93.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Collin County Weather
Warm climate with high humidity
Collin County’s average temperature of 65.0°F is well above the national median, supported by a generous 40.5 inches of annual rain. This creates a humid subtropical environment with more precipitation than many neighboring western regions.
Cooler and wetter than the state
While the 65.0°F annual temperature is just below the Texas average, Collin County is significantly wetter than the state median. It receives over eight inches more rainfall than the typical Texas county.
Dampest in the North Texas corridor
Compared to Cooke County to the northwest, Collin is nearly two degrees warmer on average. It maintains a similar precipitation level to its northern neighbors, distinguishing itself from the drier counties further west.
Steamy summers and brisk winters
July averages a high of 83.8°F, contributing to 93 days of extreme heat over 90°F each year. Winter snowfall is negligible at 1.4 inches, though January temperatures average a cool 44.9°F.
Manage moisture and peak heat
With over 40 inches of rain, proper drainage and gutter maintenance are essential for local homeowners. Residents should also prepare for roughly three months of days exceeding 90°F with robust air conditioning.
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.