Ottawa County Climate
Ottawa County, Michigan
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.1°F
Annual Precip
37.9"
Annual Snowfall
—
Extreme Heat Days
7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,547
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Ottawa County
Climate Verdict
Ottawa County has a cool, averaging 48.1°F annually, moderate rainfall of 37.9 inches per year, rare extreme heat with only 6.6 days above 90°F annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.9°F. summers are warm — July averages 70.8°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Ottawa County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Ottawa County closely matches the Michigan statewide average temperature of 45.7°F, it is somewhat wetter than average for Michigan.
Climate Profile
About Ottawa County Weather
Temperate lakeside climate follows national patterns
Ottawa County averages 48.1°F annually, providing a more temperate experience than many other Michigan locations. It receives 37.9 inches of annual precipitation, which is slightly higher than the state average.
Warmer than the average Michigan county
At 48.1°F, the county is 2.4 degrees warmer than the statewide average of 45.7°F. Lake Michigan helps moderate the extreme cold found further inland or to the north.
Milder winters than neighboring central counties
Ottawa is warmer than Saginaw County, which sits at 47.7°F. The proximity to the lake provides a thermal buffer that keeps January averages at a relatively manageable 24.9°F.
Warm summers with consistent lake breezes
July temperatures average 70.8°F, and the county typically sees 7 days per year above 90°F. While specific snowfall data is unavailable, the winter average of 27.3°F reflects the moderating influence of the Great Lakes.
Prepare for humidity and lakeside moisture
The high annual precipitation of 37.9 inches suggests residents should invest in quality drainage and roof maintenance. Moderate summer heat makes air conditioning useful for about a week of extreme days, but lakeside breezes often provide natural cooling.
Frequently Asked Questions
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Track your own weather in Ottawa County
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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.