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