Cass County Climate
Cass County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.9°F
Annual Precip
38.2"
Annual Snowfall
15.6"
Extreme Heat Days
—
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Cass County
Climate Verdict
Climate data for Cass County is currently being compiled from NOAA sources. Check back soon for detailed weather normals.
Seasonal Breakdown
Seasonal weather data for this county is based on regional climate patterns. Residents experience typical weather variations for their location, with conditions reflecting broader state and regional trends. Consult the NOAA Climate Data Online for detailed seasonal breakdowns as more granular station data becomes available.
Outdoor & Gardening Guidance
Growing season and gardening guidance for Cass County will be added as data becomes available.
Regional Context
Comparative climate data for Cass County is being processed.
Climate Profile
About Cass County Weather
Drier and Seasonal Continental Climate
Cass County receives 38.2 inches of annual precipitation, placing it below the national average for its climate type. It experiences the standard seasonal swings of the Midwest, though with slightly less total moisture.
Less Rain and Snow than Average
Cass is drier than the state average, receiving 38.2 inches of rain compared to Illinois' 41.7-inch mark. Its snowfall of 15.6 inches is also significantly lower than the averages seen in the northern half of the state.
Milder Winters than Bureau
With only 15.6 inches of annual snow, Cass County avoids the heavy 32.2-inch accumulations seen in Bureau County. It has a similar precipitation profile to Adams County, highlighting a drier trend in central Illinois.
Moderate Snow and Dry Spells
Winter is relatively manageable with 15.6 inches of snow. Though specific temperature records are unavailable, the 38.2 inches of rain suggests residents should prepare for occasional dry periods in the summer.
Monitor Moisture Levels
Since the 38.2 inches of rain is below the state average, summer irrigation may be necessary for landscaping. Basic winter prep is sufficient for the 15.6 inches of snow, which typically doesn't require heavy machinery.
Frequently Asked Questions
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Track your own weather in Cass County
Ambient Weather personal weather stations give you hyperlocal climate data.
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Data sources: ERA5 Reanalysis (modeled) via Open-Meteo (gap-filled where station data unavailable).. 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.