Washtenaw County Climate
Washtenaw County, Michigan
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.3°F
Annual Precip
34.8"
Annual Snowfall
51.2"
Extreme Heat Days
13
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,686
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Washtenaw County
Climate Verdict
Washtenaw County has a cool, averaging 48.3°F annually, moderate rainfall of 34.8 inches per year, rare extreme heat with only 13.271428571428572 days above 90°F annually, moderate snowfall of 51.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 23.6°F. summers are warm — July averages 71.5°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
Washtenaw County closely matches the Michigan statewide average temperature of 45.7°F.
Climate Profile
About Washtenaw County Weather
Balanced Seasonal Temps Below Median
Washtenaw County averages 48.3°F annually, placing it below the national median temperature. It receives 34.8 inches of precipitation, which is consistent with the standard for the Great Lakes region.
Above the State Average Temperature
The county's 48.3°F annual average is nearly three degrees warmer than the Michigan state average of 45.7°F. This reflects its southern location and slightly milder seasonal transitions.
Cooler Than Neighboring Wayne County
Washtenaw is slightly cooler than Wayne County to the east, which averages 50.1°F. However, it is warmer than northern neighbors like Tuscola, which averages only 46.3°F.
Hot Summers and Significant Snow
July peaks at an average of 71.5°F with 13 days reaching above 90°F. Winter brings a notable 51.2 inches of snow and a January average of 23.6°F.
Plan for Diverse Weather Extremes
Residents should prepare for 51 inches of snow, which is higher than many surrounding counties. Efficient air conditioning is also useful for the 13 annual days of extreme heat.
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.