Washtenaw County Climate
Washtenaw County, Michigan
Avg Annual Temp
48.3°F
Annual Precip
34.8"
Annual Snowfall
51.2"
Extreme Heat Days
13.271428571428572
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.