Climate change in St. Louis city, Missouri
Since 1979, St. Louis city, Missouri has warmed 2.7°F, with 4 more days above 90°F, 13 more nights above 70°F and 6% more precipitation a year. Its climate in 1996–2025 is most like Barton County, MO's was in 1951–1980.
- Average temperature: +2.7°F
- Summer highs (Jun–Aug): +0.2°F
- Winter lows (Dec–Feb): +4.1°F
- Precipitation: +6%
- Wettest day of the year: +31%
- Longest dry spell: −3 days
- Days above 90°F: +4 days
- Nights above 70°F: +13 days
- Freezing nights: −19 days
- Frost-free season: +9 days
- Muggy days: +10 days
- Summer heat index (Jun–Aug): +0.5°F
- Extreme fire-weather days: +8 days
- Snowfall: −38%
- Snowy days (1 inch or more): −2 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.