Summit, Illinois Climate
United States
Pop. 11,389 Elev. 189 m / 620 ft
TZ: America/Chicago (UTC-5) ·
Summit has a dry climate with warm summers reaching 84°F (29°C) in July and cold winters averaging 18°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 91°F (33°C), while wind chill can drive winter lows to 8°F (-13°C). Rain falls on about 49 days per year (34.3 in / 870 mm total), with snow on 6 days and 40 in (1022 mm) of annual accumulation. The city averages 110 sunny days per year and around 35 thunderstorm days. Ocean water temperatures reach 77°F (25°C) in summer.
| Temperature | 84°F (29°C) high | 18°F (-8°C) low |
| Feels like | 91°F (33°C) high | 8°F (-13°C) low |
| Rain | 49 days | 34.3 in (870 mm) /yr |
| Snow | 6 days | 40.3 in (1022 mm) /yr |
| Sky | 110 sunny | 35 stormy |
| Wind | 3.0 mph (1.3 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Aug, Sep
Sky & Air by Month
Cloud cover (%)
58
Jan 67
Feb 58
Mar 66
Apr 62
May 53
Jun 61
Jul 51
Aug 34
Sep 46
Oct 59
Nov 78
Dec Humidity (%)
60
Jan 66
Feb 62
Mar 64
Apr 71
May 70
Jun 76
Jul 73
Aug 71
Sep 68
Oct 68
Nov 75
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 3 mi Chicago Midway International Airport (MDW)
Ski resort 12 mi Bunny Hill
National park 12 mi Historic Pullman Foundation Exhibit Hall
Hospital 3 mi MacNeal Hospital
Hiking trail 3 mi OBT-6
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 31°F -1°C | 18°F -8°C | 0.9 in 22 mm | 6.1 in154 mm | 12 |
| February | 35°F 2°C | 21°F -6°C | 0.1 in 4 mm | 9.2 in232 mm | 3 |
| March | 55°F 13°C | 36°F 2°C | 3.4 in 87 mm | 4.9 in124 mm | 10 |
| April | 58°F 14°C | 43°F 6°C | 2.8 in 72 mm | 0.1 in4 mm | 7 |
| May | 64°F 18°C | 50°F 10°C | 4.2 in 106 mm | — | 8 |
| June | 80°F 27°C | 64°F 18°C | 5.6 in 142 mm | — | 10 |
| July | 84°F 29°C | 70°F 21°C | 4.9 in 124 mm | — | 7 |
| August | 79°F 26°C | 66°F 19°C | 3.5 in 89 mm | — | 12 |
| September | 76°F 24°C | 59°F 15°C | 1.3 in 32 mm | — | 16 |
| October | 65°F 18°C | 51°F 11°C | 3.9 in 100 mm | — | 14 |
| November | 49°F 10°C | 38°F 3°C | 1.3 in 32 mm | 12.2 in311 mm | 9 |
| December | 36°F 2°C | 23°F -5°C | 2.3 in 59 mm | 7.8 in198 mm | 2 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 12 | 1 |
| February | 3 | 0 |
| March | 10 | 3 |
| April | 7 | 2 |
| May | 8 | 5 |
| June | 10 | 6 |
| July | 7 | 7 |
| August | 12 | 5 |
| September | 16 | 3 |
| October | 14 | 2 |
| November | 9 | 0 |
| December | 2 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 36°F 2°C | 32°F 0°C |
| February | 33°F 1°C | 32°F 0°C |
| March | 38°F 4°C | 40°F 4°C |
| April | 47°F 8°C | 49°F 10°C |
| May | 54°F 12°C | 57°F 14°C |
| June | 71°F 22°C | 70°F 21°C |
| July | 76°F 25°C | 78°F 25°C |
| August | 77°F 25°C | 74°F 23°C |
| September | 69°F 21°C | 68°F 20°C |
| October | 66°F 19°C | 59°F 15°C |
| November | 53°F 12°C | 44°F 6°C |
| December | 43°F 6°C | 33°F 1°C |