Climate change in Washington County, Missouri
Since 1979, Washington County, Missouri has warmed 2.8°F, with 5 more days above 90°F, 2 more nights above 70°F and 17% more precipitation a year. Its climate in 1996–2025 is most like Howell County, MO's was in 1951–1980.
- Average temperature: +2.8°F
- Summer highs (Jun–Aug): +0.5°F
- Winter lows (Dec–Feb): +4.5°F
- Precipitation: +17%
- Wettest day of the year: +43%
- Longest dry spell: −1 days
- Days above 90°F: +5 days
- Nights above 70°F: +2 days
- Freezing nights: −23 days
- Frost-free season: +26 days
- Muggy days: +13 days
- Summer heat index (Jun–Aug): +2.3°F
- Extreme fire-weather days: +6 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.