Effingham, Illinois Climate

United States

Pop. 12,604 Elev. 181 m / 594 ft TZ: America/Chicago (UTC-5) ·

Summers in Effingham are warm, with July highs around 89°F (32°C), while winters are frigid with January lows of 19°F (-7°C). Humidity pushes the summer feels-like temperature to around 105°F (41°C). Expect around 60 rainy days annually (39.7 in / 1008 mm total), with snow on 5 days and 28 in (700 mm) of annual accumulation. The city averages 130 sunny days per year and around 43 thunderstorm days. Nearby lake water reaches 82°F (28°C) in summer.

Temperature 89°F (31°C) high 19°F (-7°C) low
Feels like 105°F (40°C) high 13°F (-11°C) low
Rain 60 days 39.7 in (1008 mm) /yr
Snow 5 days 27.6 in (700 mm) /yr
Sky 130 sunny 43 stormy
Wind 2.3 mph (1.0 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 (%)
49
Jan
61
Feb
53
Mar
64
Apr
64
May
58
Jun
59
Jul
44
Aug
34
Sep
44
Oct
52
Nov
64
Dec
Humidity (%)
67
Jan
64
Feb
53
Mar
60
Apr
63
May
68
Jun
75
Jul
68
Aug
62
Sep
66
Oct
68
Nov
72
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 52 mi Decatur Airport (DEC)
Ski resort 121 mi Hidden Valley
National park 70 mi Shakamak State Park
Mountain peak (5,125 ft) 361 mi Little Haw Knob
Hospital 1 mi Saint Anthony's Memorial Hospital
Hiking trail 55 mi Bluestem Loop

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 34°F 1°C 19°F -7°C 0.9 in 24 mm 11.9 in302 mm 13
February 43°F 6°C 27°F -3°C 1.6 in 40 mm 5.5 in138 mm 9
March 64°F 18°C 41°F 5°C 3.7 in 94 mm 0.5 in13 mm 13
April 69°F 21°C 49°F 9°C 6.1 in 154 mm 5
May 74°F 23°C 57°F 14°C 4.5 in 115 mm 7
June 85°F 30°C 69°F 21°C 5.5 in 140 mm 9
July 89°F 31°C 73°F 23°C 5.7 in 145 mm 8
August 84°F 29°C 65°F 19°C 0.8 in 22 mm 15
September 83°F 28°C 59°F 15°C 3.3 in 83 mm 18
October 71°F 21°C 51°F 10°C 3.4 in 87 mm 18
November 55°F 13°C 38°F 4°C 3.2 in 82 mm 4.0 in102 mm 10
December 43°F 6°C 29°F -2°C 0.9 in 23 mm 5.7 in146 mm 5

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 13 0
February 9 1
March 13 3
April 5 8
May 7 5
June 9 6
July 8 7
August 15 3
September 18 4
October 18 2
November 10 3
December 5 1

Water Temperatures Data

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Month Lake Avg High
January 33°F 1°C
February 33°F 0°C
March 48°F 9°C
April 58°F 14°C
May 65°F 18°C
June 76°F 24°C
July 82°F 28°C
August 77°F 25°C
September 71°F 22°C
October 62°F 17°C
November 46°F 8°C
December 34°F 1°C