St. John the Baptist Parish Climate
St. John the Baptist Parish, Louisiana
Avg Annual Temp
69.1°F
Annual Precip
67.2"
Annual Snowfall
0.0"
Extreme Heat Days
78.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About St. John the Baptist Parish Weather
Intense Warmth and Extreme Precipitation
St. John the Baptist Parish is significantly warmer and wetter than the national median, averaging 69.1°F and 67.2 inches of rain. This combination creates a truly tropical environment.
Surpassing State Heat and Rain Averages
The parish temperature of 69.1°F and rainfall of 67.2 inches both exceed the Louisiana state averages of 67.0°F and 60.8 inches. It is one of the state's warmest and dampest locales.
Warmer and Wetter Than Neighbors
The parish is warmer than St. Bernard (68.6°F) and wetter than St. James (66.2 inches). It sits at the heart of a very high-precipitation coastal corridor.
Tropical Summers and Snow-Free Winters
Residents face 79 days of heat at or above 90°F, while winters remain quite warm with a 54.8°F average. Snowfall is non-existent, reflecting the parish's deep southern location.
Prioritize Cooling and Storm Prep
With 79 extreme heat days and 67.2 inches of rain, high-capacity HVAC and storm shutters are essential. Constant humidity management is required to protect homes from moisture damage.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.