Monticello, Illinois Climate
United States
Pop. 5,509 Elev. 201 m / 659 ft
TZ: America/Chicago (UTC-5) ·
Monticello is largely arid, with warm summers peaking at 87°F (31°C) in July and cold winters around 17°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 101°F (38°C), while wind chill can drive winter lows to 8°F (-13°C). Precipitation occurs on roughly 47 days per year (28.4 in / 721 mm total), with snow on 7 days and 31 in (775 mm) of annual accumulation. The city averages 123 sunny days per year and around 31 thunderstorm days.
| Temperature | 87°F (31°C) high | 17°F (-9°C) low |
| Feels like | 101°F (38°C) high | 8°F (-13°C) low |
| Rain | 47 days | 28.4 in (721 mm) /yr |
| Snow | 7 days | 30.5 in (775 mm) /yr |
| Sky | 123 sunny | 31 stormy |
| Wind | 2.8 mph (1.3 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 (%)
51
Jan 60
Feb 55
Mar 67
Apr 61
May 59
Jun 63
Jul 46
Aug 32
Sep 44
Oct 51
Nov 69
Dec Humidity (%)
68
Jan 65
Feb 55
Mar 60
Apr 62
May 70
Jun 76
Jul 68
Aug 56
Sep 60
Oct 65
Nov 78
Dec Weather Days by Month
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 16 mi University of Illinois Willard Airport (CMI)
Ski resort 124 mi
National park 93 mi Shakamak State Park
Mountain peak
(4,938 ft) 404 mi Gregory Bald
Hospital 2 mi
Hiking trail 15 mi 5-mile Trail
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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 -9°C | 0.4 in 11 mm | 8.2 in208 mm | 14 |
| February | 40°F 4°C | 24°F -5°C | 0.3 in 8 mm | 5.8 in147 mm | 8 |
| March | 62°F 17°C | 39°F 4°C | 3.0 in 77 mm | 1.2 in30 mm | 10 |
| April | 66°F 19°C | 46°F 8°C | 4.7 in 119 mm | 0.1 in3 mm | 4 |
| May | 73°F 23°C | 54°F 12°C | 3.6 in 92 mm | — | 9 |
| June | 84°F 29°C | 67°F 19°C | 4.8 in 121 mm | — | 9 |
| July | 87°F 31°C | 71°F 22°C | 4.2 in 107 mm | — | 4 |
| August | 83°F 29°C | 65°F 18°C | 1.0 in 26 mm | — | 13 |
| September | 84°F 29°C | 58°F 14°C | 1.4 in 36 mm | — | 19 |
| October | 71°F 22°C | 50°F 10°C | 2.5 in 64 mm | — | 17 |
| November | 54°F 12°C | 37°F 3°C | 1.3 in 34 mm | 7.9 in201 mm | 11 |
| December | 39°F 4°C | 23°F -5°C | 1.1 in 27 mm | 7.3 in185 mm | 5 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 0 |
| February | 8 | 0 |
| March | 10 | 3 |
| April | 4 | 4 |
| May | 9 | 4 |
| June | 9 | 6 |
| July | 4 | 9 |
| August | 13 | 1 |
| September | 19 | 2 |
| October | 17 | 1 |
| November | 11 | 1 |
| December | 5 | 0 |