Decatur, Illinois Climate
United States
Pop. 73,254 Elev. 206 m / 676 ft
TZ: America/Chicago (UTC-5) ·
Dry and warm, Decatur sees July highs of 87°F (31°C) and cold January lows of 17°F (-8°C). Humidity pushes the summer feels-like temperature to 101°F (38°C), while wind chill can drive winter lows to 9°F (-13°C). Expect around 46 rainy days annually (30.4 in / 772 mm total), with snow on 7 days and 31 in (779 mm) of annual accumulation. The city averages 128 sunny days per year and around 28 thunderstorm days.
| Temperature | 87°F (30°C) high | 17°F (-8°C) low |
| Feels like | 101°F (38°C) high | 9°F (-13°C) low |
| Rain | 46 days | 30.4 in (772 mm) /yr |
| Snow | 7 days | 30.6 in (779 mm) /yr |
| Sky | 128 sunny | 28 stormy |
| Wind | 2.7 mph (1.2 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 (%)
50
Jan 59
Feb 53
Mar 68
Apr 60
May 58
Jun 63
Jul 46
Aug 33
Sep 44
Oct 50
Nov 68
Dec Humidity (%)
69
Jan 65
Feb 56
Mar 62
Apr 64
May 72
Jun 79
Jul 71
Aug 60
Sep 62
Oct 67
Nov 78
Dec Weather Days by Month
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 5 mi Decatur Airport (DEC)
Ski resort 142 mi
National park 103 mi Shakamak State Park
Mountain peak
(5,125 ft) 413 mi Little Haw Knob
Hospital 1 mi Saint Mary's Hospital
Hiking trail 4 mi Bluestem Loop
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 32°F 0°C | 17°F -8°C | 0.5 in 12 mm | 8.9 in226 mm | 14 |
| February | 40°F 5°C | 24°F -4°C | 0.4 in 11 mm | 5.9 in149 mm | 8 |
| March | 62°F 17°C | 40°F 4°C | 2.8 in 72 mm | 1.1 in27 mm | 13 |
| April | 67°F 20°C | 47°F 8°C | 5.1 in 129 mm | — | 4 |
| May | 74°F 23°C | 54°F 12°C | 3.7 in 95 mm | — | 10 |
| June | 84°F 29°C | 67°F 20°C | 5.4 in 137 mm | — | 9 |
| July | 87°F 30°C | 72°F 22°C | 5.1 in 130 mm | — | 4 |
| August | 83°F 28°C | 64°F 18°C | 0.9 in 23 mm | — | 15 |
| September | 83°F 28°C | 57°F 14°C | 1.8 in 46 mm | — | 18 |
| October | 71°F 22°C | 50°F 10°C | 2.0 in 51 mm | — | 16 |
| November | 54°F 12°C | 37°F 3°C | 1.7 in 42 mm | 7.2 in184 mm | 11 |
| December | 40°F 4°C | 24°F -5°C | 1.0 in 25 mm | 7.6 in193 mm | 6 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 0 |
| February | 8 | 0 |
| March | 13 | 3 |
| April | 4 | 6 |
| May | 10 | 3 |
| June | 9 | 6 |
| July | 4 | 6 |
| August | 15 | 0 |
| September | 18 | 2 |
| October | 16 | 1 |
| November | 11 | 1 |
| December | 6 | 0 |