Lanark, Illinois Climate

United States

Pop. 1,373 Elev. 269 m / 883 ft TZ: America/Chicago (UTC-5) ·

Dry and warm, Lanark sees July highs of 85°F (29°C) and cold January lows of 14°F (-10°C). Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 6°F (-14°C). Expect around 40 rainy days annually (30.3 in / 771 mm total), with snow on 5 days and 34 in (869 mm) of annual accumulation. The city averages 118 sunny days per year and around 30 thunderstorm days. Nearby lake water reaches 77°F (25°C) in summer.

Temperature 85°F (29°C) high 14°F (-10°C) low
Feels like 95°F (35°C) high 6°F (-15°C) low
Rain 40 days 30.3 in (771 mm) /yr
Snow 5 days 34.2 in (869 mm) /yr
Sky 118 sunny 30 stormy
Wind 2.4 mph (1.1 m/s) avg

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Monthly Climate Chart

↓ Monthly data table
Best months to visit: May, Sep, Oct

Sky & Air by Month

Cloud cover (%)
51
Jan
62
Feb
53
Mar
67
Apr
57
May
53
Jun
60
Jul
53
Aug
41
Sep
45
Oct
56
Nov
75
Dec
Humidity (%)
61
Jan
66
Feb
60
Mar
60
Apr
59
May
65
Jun
75
Jul
74
Aug
64
Sep
62
Oct
66
Nov
78
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 38 mi Chicago Rockford International Airport (RFD)
Ski resort 32 mi Chestnut Mountain Resort
National park 93 mi Pikes Peak State Park
Hospital 17 mi MercyHealth FHN Memorial Hospital
Hiking trail 16 mi Mississippi Palisades State Park Trails south

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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 0.9 in 23 mm 2.4 in60 mm 14
February 33°F 1°C 17°F -8°C 0.1 in 3 mm 6.7 in170 mm 7
March 56°F 14°C 34°F 1°C 3.6 in 92 mm 7.5 in189 mm 10
April 62°F 17°C 43°F 6°C 3.5 in 89 mm 4
May 71°F 22°C 51°F 10°C 3.2 in 81 mm 12
June 84°F 29°C 65°F 18°C 4.5 in 116 mm 10
July 85°F 29°C 69°F 21°C 5.4 in 137 mm 7
August 80°F 27°C 63°F 17°C 3.8 in 97 mm 13
September 80°F 26°C 57°F 14°C 1.1 in 28 mm 15
October 68°F 20°C 49°F 9°C 1.7 in 42 mm 12
November 50°F 10°C 34°F 1°C 1.0 in 26 mm 10.6 in270 mm 10
December 33°F 0°C 18°F -8°C 1.4 in 36 mm 7.1 in180 mm 4

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 14 1
February 7 0
March 10 4
April 4 2
May 12 1
June 10 4
July 7 7
August 13 6
September 15 3
October 12 1
November 10 0
December 4 1

Water Temperatures Data

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Month Lake Avg High
January 32°F 0°C
February 32°F 0°C
March 38°F 3°C
April 49°F 9°C
May 58°F 15°C
June 70°F 21°C
July 77°F 25°C
August 74°F 23°C
September 67°F 19°C
October 59°F 15°C
November 42°F 6°C
December 32°F 0°C