St. Joseph County Climate
St. Joseph County, Michigan
Avg Annual Temp
48.5°F
Annual Precip
39.7"
Annual Snowfall
41.2"
Extreme Heat Days
13.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About St. Joseph County Weather
Temperate but Cool by National Standards
With an annual average of 48.5°F, St. Joseph County remains cooler than the national median. Its precipitation level of 39.7 inches is higher than many inland U.S. counties, contributing to its lush landscape.
Above the Michigan Temperature Baseline
The county's 48.5°F average temperature comfortably exceeds the Michigan state average of 45.7°F. This makes it one of the more temperate regions in the state, particularly during the growing season.
Aligning With Southern Tier Neighbors
St. Joseph shares a similar climate with Washtenaw County, which averages 48.3°F. It is slightly cooler than Van Buren County to the west, which enjoys a warmer 49.7°F average.
Hot Summers and Snowy Winters
The county experiences 13 days of extreme heat above 90°F, peaking with a July average of 71.4°F. Winter brings 41.2 inches of snow and a chilly January average of 23.9°F.
Managing Humidity and Snowfall
High annual precipitation of 39.7 inches requires proper home drainage and moisture control. Residents should maintain efficient HVAC systems to handle both the summer heat spikes and the 26.5°F winter average.
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.