Charleston, Illinois Climate

United States

Pop. 21,196 Elev. 208 m / 682 ft TZ: America/Chicago (UTC-5) ·

Charleston sees warm summers peaking at 87°F (31°C) in July, and frigid winters that bottom out around 17°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 101°F (38°C), while wind chill can drive winter lows to 9°F (-13°C). Precipitation occurs on roughly 55 days per year (35.9 in / 911 mm total), with snow on 7 days and 31 in (784 mm) of annual accumulation. The city averages 129 sunny days per year and around 36 thunderstorm days.

Temperature 87°F (30°C) high 17°F (-8°C) low
Feels like 101°F (38°C) high 9°F (-13°C) low
Rain 55 days 35.9 in (911 mm) /yr
Snow 7 days 30.9 in (784 mm) /yr
Sky 129 sunny 36 stormy
Wind 2.6 mph (1.2 m/s) avg

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Monthly Climate Chart

↓ Monthly data table
Best months to visit: Mar, Aug, Sep, Oct

Sky & Air by Month

Cloud cover (%)
50
Jan
61
Feb
54
Mar
66
Apr
63
May
59
Jun
61
Jul
43
Aug
32
Sep
43
Oct
51
Nov
67
Dec
Humidity (%)
70
Jan
66
Feb
56
Mar
62
Apr
65
May
71
Jun
77
Jul
70
Aug
61
Sep
64
Oct
68
Nov
78
Dec

Weather Days by Month

↓ Weather days table

Cities with Similar Climate

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Nearby Cities

Nearby

Commercial airport 38 mi University of Illinois Willard Airport (CMI)
Ski resort 158 mi
National park 55 mi Shakamak State Park
Mountain peak (4,938 ft) 362 mi Gregory Bald
Hospital 5 mi Sarah Bush Lincoln Health Center
Hiking trail 50 mi 5-mile Trail

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 32°F 0°C 17°F -8°C 0.7 in 18 mm 9.9 in251 mm 14
February 41°F 5°C 25°F -4°C 0.8 in 21 mm 5.7 in144 mm 8
March 62°F 17°C 40°F 4°C 3.3 in 85 mm 1.1 in27 mm 11
April 67°F 20°C 47°F 8°C 5.9 in 149 mm 4
May 73°F 23°C 55°F 13°C 4.2 in 107 mm 6
June 83°F 29°C 68°F 20°C 6.4 in 162 mm 8
July 87°F 30°C 72°F 22°C 6.3 in 160 mm 8
August 83°F 28°C 65°F 18°C 0.8 in 19 mm 16
September 82°F 28°C 57°F 14°C 2.0 in 52 mm 20
October 70°F 21°C 50°F 10°C 2.4 in 60 mm 18
November 54°F 12°C 37°F 3°C 2.2 in 55 mm 6.3 in159 mm 11
December 41°F 5°C 26°F -4°C 0.9 in 23 mm 8.0 in203 mm 5

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 14 0
February 8 0
March 11 3
April 4 6
May 6 4
June 8 7
July 8 8
August 16 2
September 20 2
October 18 2
November 11 2
December 5 0