Calhoun County Climate

Name: Calhoun County Climate Normals
Creator: NOAA National Centers for Environmental Information
License: https://www.usa.gov/government-works

Calhoun County, Illinois

NOAA NCEI 1991-2020 Climate Normals

Avg Annual Temp

53.4°F

Annual Precip

42.2"

Annual Snowfall

12.5"

Extreme Heat Days

days >= 90°F/yr

Monthly Temperature

Precipitation Calendar

Dry

Wet❄= snowfall

❄2.5"

❄2.3"

❄3.2"

4.5"

5.3"

4.1"

3.6"

3.7"

3.4"

3.3"

❄3.7"

❄2.6"

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Growing Season & Gardening

USDA Hardiness Zone

Minimum winter temperature range for plant survival

Seasonal Overview

National Comparison

Warmer than 45% of US counties

Wetter than 51% of US counties

More seasonal variation than 76% of US counties

7-Day Outlook

Forecast

Current Conditions

Air Quality

Safety

Weather Alerts

Climate Advisory: Calhoun County

Climate Verdict

Calhoun County has a mild, with an average annual temperature of 53.4°F, moderately wet with 42.2 inches of annual precipitation, occasional hot days — 28.9 per year above 90°F, light snow averaging 12.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.

Seasonal Breakdown

Winters are cold, with January averaging 27.8°F. summers are warm — July averages 76.2°F. The 48°F seasonal variation provides noticeable but manageable change.

Outdoor & Gardening Guidance

Growing season and gardening data is currently limited for Calhoun County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.

Regional Context

Calhoun County closely matches the Illinois statewide average temperature of 52.8°F.

Frequently Asked Questions

What is the average temperature in Calhoun County?

The average annual temperature in Calhoun County, IL is 53.4°F, based on NOAA 30-year climate normals (1991-2020).

How much rain does Calhoun County get?

Calhoun County receives an average of 42.2 inches of precipitation per year, including both rain and meltwater from snow. This is based on NOAA 30-year climate normals.

Does it snow in Calhoun County?

Yes, Calhoun County receives an average of 12.5 inches of snowfall per year according to NOAA climate normals.

How hot does Calhoun County get in summer?

The average summer temperature (June-August) in Calhoun County is 74.4°F. The county experiences an average of 29 days per year above 90°F.

How cold are winters in Calhoun County?

The average winter temperature (December-February) in Calhoun County is 30.9°F. January, typically the coldest month, averages 27.8°F.

Track your own weather in Calhoun 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.

By Evan Brooks, Data EditorUpdated May 14, 2026Reviewed by Evan Brooks, Data Editor

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