Chester, Illinois Climate

United States

Pop. 8,588 Elev. 201 m / 659 ft TZ: America/Chicago (UTC-5) ·

Summers in Chester are warm, with July highs around 89°F (32°C), while winters are frigid with January lows of 23°F (-5°C). Humidity pushes the summer feels-like temperature to around 108°F (42°C). Expect around 65 rainy days annually (44.2 in / 1122 mm total), with snow on 5 days and 22 in (547 mm) of annual accumulation. The city averages 130 sunny days per year and around 48 thunderstorm days. Nearby lake water reaches 83°F (29°C) in summer.

Temperature 89°F (32°C) high 23°F (-5°C) low
Feels like 108°F (42°C) high 19°F (-7°C) low
Rain 65 days 44.2 in (1122 mm) /yr
Snow 5 days 21.5 in (547 mm) /yr
Sky 130 sunny 48 stormy
Wind 2.2 mph (1.0 m/s) avg

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Monthly Climate Chart

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

Sky & Air by Month

Cloud cover (%)
46
Jan
60
Feb
52
Mar
64
Apr
67
May
56
Jun
56
Jul
43
Aug
41
Sep
40
Oct
54
Nov
55
Dec
Humidity (%)
61
Jan
67
Feb
50
Mar
63
Apr
67
May
73
Jun
76
Jul
66
Aug
63
Sep
68
Oct
67
Nov
69
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 44 mi Scott AFB/Midamerica Airport (BLV)
Ski resort 62 mi Hidden Valley
National park 45 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 1 mi Memorial Hospital
Hiking trail 16 mi ADT - Illinois (South) - J - Seg 3

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 38°F 4°C 23°F -5°C 2.1 in 53 mm 7.8 in198 mm 13
February 45°F 7°C 28°F -2°C 2.3 in 58 mm 8.5 in217 mm 8
March 66°F 19°C 43°F 6°C 2.4 in 61 mm 0.1 in3 mm 12
April 71°F 22°C 51°F 10°C 6.9 in 175 mm 6
May 74°F 24°C 58°F 14°C 5.2 in 132 mm 8
June 85°F 30°C 70°F 21°C 6.7 in 171 mm 8
July 89°F 32°C 74°F 23°C 4.6 in 117 mm 10
August 86°F 30°C 66°F 19°C 0.6 in 16 mm 14
September 85°F 29°C 60°F 16°C 4.5 in 114 mm 14
October 72°F 22°C 52°F 11°C 5.3 in 135 mm 18
November 59°F 15°C 41°F 5°C 2.9 in 73 mm 3.3 in83 mm 10
December 47°F 8°C 32°F 0°C 0.7 in 17 mm 1.8 in47 mm 9

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 13 1
February 8 1
March 12 3
April 6 9
May 8 8
June 8 8
July 10 7
August 14 1
September 14 4
October 18 2
November 10 4
December 9 0

Water Temperatures Data

↑ See chart
Month Lake Avg High
January 34°F 1°C
February 34°F 1°C
March 48°F 9°C
April 59°F 15°C
May 66°F 19°C
June 77°F 25°C
July 83°F 29°C
August 79°F 26°C
September 72°F 22°C
October 64°F 18°C
November 49°F 9°C
December 36°F 2°C