CHARLESTON, IL

Overview:
Charleston, IL is located in Coles County in Eastern Illinois, approximately 35 miles from the border with Indiana. Agriculture is the leading industry in this area and is supported by a large growing season, sunshine 70% of the time, and 64% of all precipitation falling between April and October. Thunderstorms are also common in this area during the summer months and can produce heavy precipitation.

Overall, this area experiences mild conditions with an average temperature of 54.3°F and relative humidity of 52% in the summer. However, the winter season cannot go unnoticed in Charleston, with an average seasonal snowfall of 23.1 inches and 95.8 days per year below freezing.

State/ Province ID: IL

Station ID: C00111436

Directory Name: CHARLESTON_HCN_IL_C00111436

Elevation: 213.40m

The resources presented here were developed in cooperation with the Office of the Michigan State Climatologist using data from the National Centers for Environmental Information. For more information regarding our data sources, quality control, and methodology, please see our Historical Climatologies: Quality Control reference guide.

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Recent Climate Summary, 1991-2020


Average Temperature	54.3°F12.4°C
Average Low Temperature	44.5°F6.9°C
Average High Temperature	64.2°17.9°C
Days/Year that exceed 90°F	20.6
Days/Year that fall below 32°F	95.8
Lowest Annual Average Temperature	52.2°F11.2°C
Highest Annual Average Temperature	56.9°F13.9°C
Average Annual Total Precipitation	42.2 in107.1 cm
Lowest Annual Precipitation Total	31.0 in78.8 cm
Highest Annual Precipitation Total	56.6 in143.9 cm
Days/Year that exceed 1.25" of Precipitation	6.4

Temperature

Click on the following links to be taken to the corresponding portion of the page.

Monthly Average Temperature
How Temperatures are Changing
- Changes in Average Temperature – Includes a summary table of the average annual and seasonal temperature changes, and time series graphs of how the annual low, average, and high temperatures compare to the long term average plotted for every year on record.
- Cold Temperatures – View time series plots of the number of days per year below 32°F and the number of heating degree days per year to see how cold days are changing.
- Hot Temperatures – View time series plots of the number of days per year above 90°F and the number of cooling degree days per year to see how hot days are changing.
- Growing Season Changes – View a time series of the annual number of days in the freeze-free period.

Monthly Average Temperature

Changes in Average Temperature, 1951-2020.


	°F°C
Annual average temperature	2.71.5
Winter average temperature	3.41.9
Spring average temperature	3.31.8
Summer average temperature	1.50.8
Fall average temperature	0.40.2

Annual High and Low Temperature Departure

Cold Temperatures

¹Heating Degree Days (HDDs) are indexed units, not actual days, that roughly describe the demand to heat a building. HDDs accumulate on days colder than 65°F when heating is required. Every degree below 65°F is added to the annual total for an annual HDD value, which is plotted in the figure.

Hot Temperatures

²Cooling Degree Days (CDDs) are indexed units, not actual days, that roughly describe the demand to cool a building. CDDs accumulate on days warmer than 65°F when cooling is required. Every degree above 65°F is added to the annual total for an annual CDD value, which is plotted in the figure.

Growing Season Changes

Precipitation