Marengo, Illinois Climate
United States
Pop. 7,503 Elev. 255 m / 837 ft
TZ: America/Chicago (UTC-5) ·
Marengo is largely arid, with warm summers peaking at 85°F (29°C) in July and cold winters around 14°F (-10°C) in January. Humidity pushes the summer feels-like temperature to 93°F (34°C), while wind chill can drive winter lows to 5°F (-15°C). Precipitation occurs on roughly 43 days per year (31.6 in / 802 mm total), with snow on 5 days and 35 in (889 mm) of annual accumulation. The city averages 116 sunny days per year and around 32 thunderstorm days. Ocean water temperatures reach 74°F (23°C) in summer.
| Temperature | 85°F (29°C) high | 14°F (-10°C) low |
| Feels like | 93°F (34°C) high | 5°F (-15°C) low |
| Rain | 43 days | 31.6 in (802 mm) /yr |
| Snow | 5 days | 35.0 in (889 mm) /yr |
| Sky | 116 sunny | 32 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, Sep, Oct
Sky & Air by Month
Cloud cover (%)
56
Jan 64
Feb 58
Mar 67
Apr 61
May 53
Jun 60
Jul 49
Aug 36
Sep 46
Oct 57
Nov 77
Dec Humidity (%)
61
Jan 67
Feb 60
Mar 61
Apr 64
May 66
Jun 73
Jul 74
Aug 70
Sep 70
Oct 68
Nov 75
Dec Weather Days by Month
Water Temperatures
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Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 25 mi Chicago Rockford International Airport (RFD)
Ski resort 21 mi Norge Ski Club
National park 64 mi Historic Pullman Foundation Exhibit Hall
Hospital 12 mi Mercyhealth Hospital and Medical Center-Harvard
Hiking trail 2 mi Nature Loop
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 30°F -1°C | 14°F -10°C | 0.7 in 17 mm | 2.8 in71 mm | 12 |
| February | 33°F 0°C | 17°F -8°C | 0.2 in 5 mm | 8.4 in214 mm | 6 |
| March | 55°F 13°C | 33°F 1°C | 3.4 in 85 mm | 5.8 in148 mm | 9 |
| April | 60°F 15°C | 41°F 5°C | 3.3 in 83 mm | 0.1 in3 mm | 4 |
| May | 67°F 20°C | 48°F 9°C | 3.4 in 86 mm | — | 8 |
| June | 83°F 28°C | 63°F 17°C | 4.1 in 105 mm | — | 10 |
| July | 85°F 29°C | 68°F 20°C | 5.2 in 132 mm | — | 7 |
| August | 79°F 26°C | 62°F 17°C | 4.0 in 101 mm | — | 14 |
| September | 76°F 25°C | 56°F 13°C | 2.9 in 74 mm | — | 18 |
| October | 65°F 18°C | 48°F 9°C | 1.7 in 43 mm | — | 14 |
| November | 48°F 9°C | 34°F 1°C | 1.1 in 27 mm | 10.0 in255 mm | 10 |
| December | 33°F 1°C | 19°F -7°C | 1.8 in 44 mm | 7.8 in199 mm | 4 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 12 | 1 |
| February | 6 | 0 |
| March | 9 | 5 |
| April | 4 | 1 |
| May | 8 | 3 |
| June | 10 | 4 |
| July | 7 | 6 |
| August | 14 | 6 |
| September | 18 | 4 |
| October | 14 | 1 |
| November | 10 | 0 |
| December | 4 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 38°F 3°C | 32°F 0°C |
| February | 34°F 1°C | 32°F 0°C |
| March | 36°F 2°C | 36°F 2°C |
| April | 42°F 6°C | 46°F 8°C |
| May | 48°F 9°C | 55°F 13°C |
| June | 66°F 19°C | 67°F 19°C |
| July | 74°F 23°C | 76°F 24°C |
| August | 73°F 23°C | 73°F 23°C |
| September | 69°F 20°C | 65°F 18°C |
| October | 67°F 19°C | 59°F 15°C |
| November | 51°F 11°C | 43°F 6°C |
| December | 43°F 6°C | 32°F 0°C |