Vandalia, Illinois Climate

United States

Pop. 7,112 Elev. 161 m / 528 ft TZ: America/Chicago (UTC-5) ·

Vandalia sees warm summers peaking at 88°F (31°C) in July, and frigid winters that bottom out around 19°F (-7°C) in January. Humidity pushes the summer feels-like temperature to around 104°F (40°C). Precipitation occurs on roughly 54 days per year (38.9 in / 989 mm total), with snow on 5 days and 28 in (714 mm) of annual accumulation. The city averages 134 sunny days per year and around 41 thunderstorm days. Nearby lake water reaches 82°F (28°C) in summer.

Temperature 88°F (31°C) high 19°F (-7°C) low
Feels like 104°F (40°C) high 13°F (-11°C) low
Rain 54 days 38.9 in (989 mm) /yr
Snow 5 days 28.1 in (714 mm) /yr
Sky 134 sunny 41 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
60
Feb
52
Mar
65
Apr
63
May
57
Jun
59
Jul
45
Aug
35
Sep
44
Oct
52
Nov
64
Dec
Humidity (%)
67
Jan
65
Feb
53
Mar
60
Apr
63
May
69
Jun
76
Jul
69
Aug
63
Sep
67
Oct
68
Nov
73
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

Cities with Similar Climate

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Nearby Cities

Nearby

Commercial airport 49 mi Scott AFB/Midamerica Airport (BLV)
Ski resort 89 mi Hidden Valley
National park 79 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 1 mi Fayette County Hospital
Hiking trail 60 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 0.8 in 19 mm 12.2 in309 mm 13
February 43°F 6°C 27°F -3°C 1.2 in 31 mm 6.3 in161 mm 9
March 64°F 18°C 41°F 5°C 2.9 in 73 mm 0.5 in12 mm 15
April 69°F 21°C 49°F 9°C 5.9 in 150 mm 6
May 74°F 24°C 56°F 14°C 4.7 in 119 mm 7
June 85°F 29°C 69°F 21°C 6.2 in 158 mm 9
July 88°F 31°C 73°F 23°C 5.9 in 150 mm 8
August 84°F 29°C 65°F 19°C 0.8 in 22 mm 15
September 83°F 28°C 58°F 14°C 3.2 in 82 mm 18
October 71°F 22°C 51°F 10°C 3.3 in 84 mm 18
November 56°F 13°C 38°F 3°C 3.1 in 80 mm 4.4 in111 mm 10
December 43°F 6°C 28°F -2°C 0.8 in 21 mm 4.7 in120 mm 6

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 13 0
February 9 1
March 15 3
April 6 6
May 7 5
June 9 6
July 8 11
August 15 1
September 18 3
October 18 2
November 10 2
December 6 1

Water Temperatures Data

↑ See chart
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