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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Explore on the MapMonthly Climate Chart
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
Cities with Similar Climate
Find similar cities on the map →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 |