Thornton, Illinois Climate
United States
Pop. 2,492 Elev. 186 m / 610 ft
TZ: America/Chicago (UTC-5) ·
Thornton sees mild summers peaking at 84°F (29°C) in July, and frigid winters that bottom out around 17°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 93°F (34°C), while wind chill can drive winter lows to 8°F (-13°C). Precipitation occurs on roughly 51 days per year (37.6 in / 954 mm total), with snow on 6 days and 41 in (1032 mm) of annual accumulation. The city averages 108 sunny days per year and around 33 thunderstorm days. Ocean water temperatures reach 77°F (25°C) in summer.
| Temperature | 84°F (29°C) high | 17°F (-8°C) low |
| Feels like | 93°F (34°C) high | 8°F (-13°C) low |
| Rain | 51 days | 37.6 in (954 mm) /yr |
| Snow | 6 days | 40.6 in (1032 mm) /yr |
| Sky | 108 sunny | 33 stormy |
| Wind | 2.9 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 (%)
60
Jan 68
Feb 57
Mar 65
Apr 63
May 55
Jun 62
Jul 51
Aug 35
Sep 46
Oct 59
Nov 79
Dec Humidity (%)
62
Jan 66
Feb 61
Mar 63
Apr 70
May 70
Jun 75
Jul 74
Aug 69
Sep 66
Oct 69
Nov 76
Dec Weather Days by Month
Water Temperatures
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Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 11 mi Gary/Chicago International Airport (GYY)
Ski resort 24 mi Bunny Hill
National park 9 mi Historic Pullman Foundation Exhibit Hall
Hospital 4 mi Ingalls Memorial Hospital
Hiking trail 3 mi OBT-4
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 31°F -1°C | 17°F -8°C | 0.7 in 17 mm | 6.7 in170 mm | 10 |
| February | 36°F 2°C | 22°F -6°C | 0.2 in 5 mm | 8.3 in211 mm | 3 |
| March | 57°F 14°C | 37°F 3°C | 3.5 in 89 mm | 4.4 in112 mm | 8 |
| April | 60°F 15°C | 43°F 6°C | 3.7 in 94 mm | 0.1 in3 mm | 8 |
| May | 66°F 19°C | 50°F 10°C | 4.4 in 111 mm | — | 6 |
| June | 81°F 27°C | 64°F 18°C | 6.3 in 159 mm | — | 10 |
| July | 84°F 29°C | 70°F 21°C | 6.1 in 156 mm | — | 8 |
| August | 79°F 26°C | 64°F 18°C | 3.7 in 94 mm | — | 12 |
| September | 77°F 25°C | 57°F 14°C | 1.4 in 35 mm | — | 18 |
| October | 67°F 19°C | 50°F 10°C | 4.4 in 113 mm | — | 14 |
| November | 50°F 10°C | 37°F 3°C | 1.4 in 35 mm | 12.8 in325 mm | 9 |
| December | 36°F 2°C | 22°F -5°C | 1.8 in 47 mm | 8.3 in212 mm | 2 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 10 | 1 |
| February | 3 | 0 |
| March | 8 | 4 |
| April | 8 | 2 |
| May | 6 | 4 |
| June | 10 | 4 |
| July | 8 | 7 |
| August | 12 | 4 |
| September | 18 | 2 |
| October | 14 | 3 |
| November | 9 | 1 |
| 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 | 39°F 4°C |
| April | 47°F 8°C | 49°F 9°C |
| May | 54°F 12°C | 57°F 14°C |
| June | 71°F 22°C | 70°F 21°C |
| July | 76°F 25°C | 79°F 26°C |
| August | 77°F 25°C | 75°F 24°C |
| September | 69°F 21°C | 67°F 19°C |
| October | 66°F 19°C | 60°F 15°C |
| November | 53°F 12°C | 44°F 7°C |
| December | 43°F 6°C | 33°F 0°C |