Climate change in St. Tammany Parish, Louisiana
Since 1979, St. Tammany Parish, Louisiana has warmed 3.1°F, with 22 more days above 90°F, 33 more nights above 70°F and 1% more precipitation a year. Its climate in 1996–2025 is most like St. Charles Parish, LA's was in 1951–1980.
- Average temperature: +3.1°F
- Summer highs (Jun–Aug): +1.6°F
- Winter lows (Dec–Feb): +4.0°F
- Precipitation: +1%
- Wettest day of the year: +22%
- Longest dry spell: +2 days
- Days above 90°F: +22 days
- Nights above 70°F: +33 days
- Freezing nights: −12 days
- Frost-free season: +19 days
- Muggy days: +23 days
- Summer heat index (Jun–Aug): +3.4°F
- Extreme fire-weather days: +9 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.