Climate change in Collin County, Texas
Since 1979, Collin County, Texas has warmed 3.2°F, with 18 more days above 90°F, 27 more nights above 70°F and 3% less precipitation a year. Its climate in 1996–2025 is most like Ellis County, TX's was in 1951–1980.
- Average temperature: +3.2°F
- Summer highs (Jun–Aug): +2.0°F
- Winter lows (Dec–Feb): +3.6°F
- Precipitation: −3%
- Wettest day of the year: +3%
- Longest dry spell: +1 days
- Days above 90°F: +18 days
- Nights above 70°F: +27 days
- Freezing nights: −12 days
- Frost-free season: +22 days
- Muggy days: −1 days
- Summer heat index (Jun–Aug): +1.9°F
- Extreme fire-weather days: +14 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.