Mason City, Illinois Climate
United States
Pop. 2,180 Elev. 175 m / 574 ft
TZ: America/Chicago (UTC-5) ·
Mason City has a dry climate with warm summers reaching 88°F (31°C) in July and cold winters averaging 18°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 103°F (39°C), while wind chill can drive winter lows to 11°F (-12°C). Rain falls on about 49 days per year (31.9 in / 810 mm total), with snow on 5 days and 28 in (706 mm) of annual accumulation. The city averages 133 sunny days per year and around 34 thunderstorm days. Nearby lake water reaches 79°F (26°C) in summer.
| Temperature | 88°F (31°C) high | 18°F (-8°C) low |
| Feels like | 103°F (39°C) high | 11°F (-12°C) low |
| Rain | 49 days | 31.9 in (810 mm) /yr |
| Snow | 5 days | 27.8 in (706 mm) /yr |
| Sky | 133 sunny | 34 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 52
Mar 67
Apr 56
May 53
Jun 66
Jul 49
Aug 37
Sep 43
Oct 50
Nov 68
Dec Humidity (%)
63
Jan 64
Feb 55
Mar 60
Apr 59
May 71
Jun 76
Jul 73
Aug 60
Sep 59
Oct 65
Nov 77
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 25 mi Abraham Lincoln Capital Airport (SPI)
Ski resort 126 mi Hidden Valley
National park 168 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 17 mi Abraham Lincoln Memorial Hospital
Hiking trail 36 mi Meadow Valley Park
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 33°F 1°C | 18°F -8°C | 0.3 in 7 mm | 6.7 in170 mm | 14 |
| February | 40°F 4°C | 23°F -5°C | 0.2 in 6 mm | 4.0 in101 mm | 9 |
| March | 62°F 17°C | 39°F 4°C | 3.4 in 87 mm | 2.1 in53 mm | 12 |
| April | 67°F 20°C | 47°F 8°C | 4.6 in 116 mm | 0.0 in0 mm | 4 |
| May | 75°F 24°C | 54°F 12°C | 3.7 in 93 mm | — | 11 |
| June | 85°F 29°C | 67°F 19°C | 5.5 in 139 mm | — | 10 |
| July | 88°F 31°C | 72°F 22°C | 6.3 in 161 mm | — | 5 |
| August | 83°F 28°C | 64°F 18°C | 1.9 in 49 mm | — | 16 |
| September | 83°F 28°C | 57°F 14°C | 0.9 in 24 mm | — | 18 |
| October | 72°F 22°C | 51°F 11°C | 2.2 in 57 mm | — | 14 |
| November | 54°F 12°C | 37°F 3°C | 1.6 in 42 mm | 7.2 in183 mm | 13 |
| December | 39°F 4°C | 22°F -5°C | 1.1 in 29 mm | 7.8 in198 mm | 7 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 0 |
| February | 9 | 0 |
| March | 12 | 4 |
| April | 4 | 6 |
| May | 11 | 2 |
| June | 10 | 5 |
| July | 5 | 9 |
| August | 16 | 3 |
| September | 18 | 2 |
| October | 14 | 1 |
| November | 13 | 1 |
| December | 7 | 1 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 32°F 0°C |
| February | 32°F 0°C |
| March | 42°F 6°C |
| April | 53°F 12°C |
| May | 61°F 16°C |
| June | 73°F 23°C |
| July | 79°F 26°C |
| August | 75°F 24°C |
| September | 68°F 20°C |
| October | 59°F 15°C |
| November | 43°F 6°C |
| December | 32°F 0°C |