Collin County Climate
Collin County, Texas
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
65.0°F
Annual Precip
40.5"
Annual Snowfall
1.4"
Extreme Heat Days
93
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
6,113
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Collin County
Climate Verdict
Collin County has a warm, averaging 65.0°F year-round, moderately wet with 40.5 inches of annual precipitation, significant summer heat with 93.35000000000001 days annually above 90°F, light snow averaging 1.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 44.9°F. summers are hot, with July averaging 83.8°F. The 39°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Collin County closely matches the Texas statewide average temperature of 65.5°F, it is also noticeably wetter, receiving 8.7 inches more precipitation than the state average.
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 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.