St. Joseph County Climate
St. Joseph County, Michigan
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.5°F
Annual Precip
39.7"
Annual Snowfall
41.2"
Extreme Heat Days
13
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,716
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: St. Joseph County
Climate Verdict
St. Joseph County has a cool, averaging 48.5°F annually, moderate rainfall of 39.7 inches per year, rare extreme heat with only 13.1 days above 90°F annually, moderate snowfall of 41.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 23.9°F. summers are warm — July averages 71.4°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
St. Joseph County closely matches the Michigan statewide average temperature of 45.7°F, it is also noticeably wetter, receiving 5.3 inches more precipitation than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.