Somonauk, Illinois Climate
United States
Pop. 1,877 Elev. 212 m / 696 ft
TZ: America/Chicago (UTC-5) ·
Somonauk is largely arid, with warm summers peaking at 86°F (30°C) in July and cold winters around 15°F (-9°C) in January. Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 6°F (-14°C). Precipitation occurs on roughly 45 days per year (31.5 in / 799 mm total), with snow on 4 days and 33 in (845 mm) of annual accumulation. The city averages 118 sunny days per year and around 36 thunderstorm days.
| Temperature | 86°F (30°C) high | 15°F (-9°C) low |
| Feels like | 95°F (35°C) high | 6°F (-15°C) low |
| Rain | 45 days | 31.5 in (799 mm) /yr |
| Snow | 4 days | 33.3 in (845 mm) /yr |
| Sky | 118 sunny | 36 stormy |
| Wind | 2.6 mph (1.2 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Apr, Sep, Oct
Sky & Air by Month
Cloud cover (%)
54
Jan 63
Feb 55
Mar 67
Apr 59
May 53
Jun 62
Jul 53
Aug 36
Sep 46
Oct 57
Nov 75
Dec Humidity (%)
60
Jan 66
Feb 58
Mar 59
Apr 61
May 64
Jun 73
Jul 74
Aug 66
Sep 64
Oct 66
Nov 77
Dec Weather Days by Month
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Nearby
Commercial airport 44 mi Chicago Rockford International Airport (RFD)
Ski resort 27 mi
National park 55 mi Historic Pullman Foundation Exhibit Hall
Hospital 4 mi Northwestern Medicine Valley West Hospital
Hiking trail 17 mi ADT - Illinois - I - Seg 2
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 31°F -1°C | 15°F -9°C | 1.1 in 27 mm | 3.7 in93 mm | 14 |
| February | 35°F 1°C | 19°F -7°C | 0.1 in 2 mm | 7.0 in177 mm | 6 |
| March | 57°F 14°C | 35°F 2°C | 3.5 in 90 mm | 4.7 in119 mm | 12 |
| April | 62°F 17°C | 43°F 6°C | 3.1 in 80 mm | 0.0 in1 mm | 4 |
| May | 70°F 21°C | 50°F 10°C | 3.6 in 91 mm | — | 9 |
| June | 84°F 29°C | 64°F 18°C | 3.8 in 98 mm | — | 10 |
| July | 86°F 30°C | 69°F 21°C | 5.5 in 138 mm | — | 6 |
| August | 80°F 27°C | 63°F 17°C | 3.5 in 90 mm | — | 13 |
| September | 79°F 26°C | 56°F 13°C | 2.2 in 56 mm | — | 18 |
| October | 67°F 20°C | 49°F 9°C | 1.9 in 48 mm | — | 13 |
| November | 50°F 10°C | 35°F 2°C | 1.2 in 30 mm | 10.2 in259 mm | 9 |
| December | 34°F 1°C | 19°F -7°C | 1.9 in 49 mm | 7.7 in196 mm | 4 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 1 |
| February | 6 | 0 |
| March | 12 | 3 |
| April | 4 | 2 |
| May | 9 | 3 |
| June | 10 | 5 |
| July | 6 | 9 |
| August | 13 | 6 |
| September | 18 | 5 |
| October | 13 | 1 |
| November | 9 | 0 |
| December | 4 | 1 |