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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Monthly Climate Chart

↓ Monthly data table
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

↓ Weather days table

Water Temperatures

↓ Water temperatures table

Cities with Similar Climate

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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