Monmouth, Illinois Climate
United States
Pop. 9,291 Elev. 236 m / 774 ft
TZ: America/Chicago (UTC-5) ·
Monmouth has a dry climate with warm summers reaching 88°F (31°C) in July and cold winters averaging 16°F (-9°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). Rain falls on about 39 days per year (29.1 in / 739 mm total), with snow on 3 days and 30 in (770 mm) of annual accumulation. The city averages 122 sunny days per year and around 31 thunderstorm days. Nearby lake water reaches 81°F (27°C) in summer.
| Temperature | 88°F (31°C) high | 16°F (-9°C) low |
| Feels like | 101°F (38°C) high | 8°F (-13°C) low |
| Rain | 39 days | 29.1 in (739 mm) /yr |
| Snow | 3 days | 30.3 in (770 mm) /yr |
| Sky | 122 sunny | 31 stormy |
| Wind | 2.5 mph (1.1 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: May, Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
50
Jan 58
Feb 50
Mar 67
Apr 54
May 53
Jun 63
Jul 51
Aug 42
Sep 45
Oct 52
Nov 69
Dec Humidity (%)
62
Jan 64
Feb 58
Mar 60
Apr 55
May 63
Jun 70
Jul 70
Aug 55
Sep 57
Oct 64
Nov 77
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 27 mi Southeast Iowa Regional Airport (BRL)
Ski resort 98 mi Chestnut Mountain Resort
National park 148 mi Pikes Peak State Park
Hospital 1 mi OSF Holy Family Medical Center
Hiking trail 49 mi ADT - Illinois - I - Seg 3
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 32°F 0°C | 16°F -9°C | 0.8 in 21 mm | 3.4 in86 mm | 12 |
| February | 36°F 2°C | 21°F -6°C | 0.1 in 4 mm | 4.5 in114 mm | 8 |
| March | 59°F 15°C | 37°F 3°C | 3.2 in 81 mm | 6.5 in165 mm | 13 |
| April | 65°F 19°C | 45°F 7°C | 4.3 in 110 mm | — | 4 |
| May | 75°F 24°C | 53°F 12°C | 2.6 in 67 mm | — | 12 |
| June | 86°F 30°C | 67°F 19°C | 5.0 in 127 mm | — | 10 |
| July | 88°F 31°C | 71°F 22°C | 5.2 in 131 mm | — | 8 |
| August | 83°F 28°C | 65°F 18°C | 2.6 in 67 mm | — | 13 |
| September | 83°F 29°C | 59°F 15°C | 0.9 in 23 mm | — | 13 |
| October | 72°F 22°C | 51°F 11°C | 1.5 in 39 mm | — | 14 |
| November | 53°F 12°C | 36°F 2°C | 1.3 in 32 mm | 7.9 in201 mm | 10 |
| December | 36°F 2°C | 20°F -7°C | 1.4 in 36 mm | 8.0 in204 mm | 5 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 12 | 1 |
| February | 8 | 0 |
| March | 13 | 3 |
| April | 4 | 4 |
| May | 12 | 2 |
| June | 10 | 4 |
| July | 8 | 6 |
| August | 13 | 3 |
| September | 13 | 3 |
| October | 14 | 2 |
| November | 10 | 2 |
| December | 5 | 1 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 32°F 0°C |
| February | 32°F 0°C |
| March | 38°F 4°C |
| April | 50°F 10°C |
| May | 60°F 16°C |
| June | 72°F 22°C |
| July | 81°F 27°C |
| August | 76°F 24°C |
| September | 68°F 20°C |
| October | 61°F 16°C |
| November | 45°F 7°C |
| December | 33°F 1°C |