Mount Vernon, Illinois Climate
United States
Pop. 15,087 Elev. 155 m / 509 ft
TZ: America/Chicago (UTC-5) ·
Summers in Mount Vernon are warm, with July highs around 90°F (32°C), while winters are frigid with January lows of 22°F (-6°C). Humidity pushes the summer feels-like temperature to around 107°F (42°C). Expect around 64 rainy days annually (44.3 in / 1126 mm total), with snow on 5 days and 20 in (504 mm) of annual accumulation. The city averages 132 sunny days per year and around 43 thunderstorm days. Nearby lake water reaches 83°F (29°C) in summer.
| Temperature | 90°F (32°C) high | 22°F (-5°C) low |
| Feels like | 107°F (42°C) high | 17°F (-8°C) low |
| Rain | 64 days | 44.3 in (1126 mm) /yr |
| Snow | 5 days | 19.8 in (504 mm) /yr |
| Sky | 132 sunny | 43 stormy |
| Wind | 2.4 mph (1.1 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 (%)
48
Jan 60
Feb 52
Mar 64
Apr 65
May 55
Jun 56
Jul 44
Aug 38
Sep 42
Oct 53
Nov 59
Dec Humidity (%)
64
Jan 66
Feb 51
Mar 61
Apr 64
May 69
Jun 74
Jul 66
Aug 61
Sep 67
Oct 67
Nov 69
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 40 mi Veterans Airport of Southern Illinois (MWA)
Ski resort 96 mi Hidden Valley
National park 34 mi Emmett Till and Mamie Till-Mobley National Monument
Mountain peak
(5,125 ft) 340 mi Little Haw Knob
Hospital 2 mi Crossroads Community Hospital
Hiking trail 42 mi Crab Orchard Visitor Center Pond and Woodland Nature Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 37°F 3°C | 22°F -5°C | 1.9 in 47 mm | 8.8 in224 mm | 12 |
| February | 45°F 7°C | 29°F -2°C | 2.8 in 72 mm | 7.5 in192 mm | 8 |
| March | 66°F 19°C | 44°F 6°C | 2.8 in 71 mm | 0.2 in6 mm | 12 |
| April | 71°F 22°C | 51°F 11°C | 6.8 in 174 mm | — | 7 |
| May | 75°F 24°C | 59°F 15°C | 6.0 in 153 mm | — | 8 |
| June | 86°F 30°C | 71°F 22°C | 5.4 in 137 mm | — | 8 |
| July | 90°F 32°C | 75°F 24°C | 5.3 in 135 mm | — | 10 |
| August | 86°F 30°C | 67°F 19°C | 0.7 in 17 mm | — | 16 |
| September | 84°F 29°C | 61°F 16°C | 4.3 in 109 mm | — | 16 |
| October | 72°F 22°C | 52°F 11°C | 4.4 in 111 mm | — | 18 |
| November | 58°F 15°C | 41°F 5°C | 3.1 in 78 mm | 1.2 in29 mm | 10 |
| December | 46°F 8°C | 32°F 0°C | 0.9 in 22 mm | 2.1 in53 mm | 7 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 12 | 1 |
| February | 8 | 2 |
| March | 12 | 4 |
| April | 7 | 9 |
| May | 8 | 4 |
| June | 8 | 7 |
| July | 10 | 8 |
| August | 16 | 1 |
| September | 16 | 3 |
| October | 18 | 2 |
| November | 10 | 2 |
| December | 7 | 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 |