Rock Falls, Illinois Climate

United States

Pop. 9,087 Elev. 200 m / 656 ft TZ: America/Chicago (UTC-5) ·

Rock Falls is largely arid, with warm summers peaking at 86°F (30°C) in July and cold winters around 15°F (-9°C) in January. Humidity pushes the summer feels-like temperature to 97°F (36°C), while wind chill can drive winter lows to 6°F (-14°C). Precipitation occurs on roughly 41 days per year (30.1 in / 764 mm total), with snow on 4 days and 32 in (821 mm) of annual accumulation. The city averages 121 sunny days per year and around 30 thunderstorm days. Nearby lake water reaches 77°F (25°C) in summer.

Temperature 86°F (30°C) high 15°F (-9°C) low
Feels like 97°F (36°C) high 6°F (-14°C) low
Rain 41 days 30.1 in (764 mm) /yr
Snow 4 days 32.3 in (821 mm) /yr
Sky 121 sunny 30 stormy
Wind 2.6 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
61
Feb
52
Mar
67
Apr
57
May
52
Jun
61
Jul
53
Aug
40
Sep
44
Oct
55
Nov
74
Dec
Humidity (%)
61
Jan
66
Feb
58
Mar
59
Apr
58
May
64
Jun
73
Jul
73
Aug
60
Sep
59
Oct
65
Nov
78
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 42 mi Chicago Rockford International Airport (RFD)
Ski resort 52 mi Chestnut Mountain Resort
National park 114 mi Pikes Peak State Park
Hospital 2 mi CGH Medical Center
Hiking trail 21 mi Heather Valley

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 31°F -1°C 15°F -9°C 1.4 in 34 mm 2.8 in71 mm 15
February 34°F 1°C 18°F -8°C 0.1 in 3 mm 6.3 in161 mm 7
March 58°F 14°C 35°F 2°C 4.1 in 103 mm 6.1 in154 mm 11
April 63°F 17°C 44°F 7°C 3.7 in 95 mm 5
May 72°F 22°C 52°F 11°C 3.1 in 78 mm 11
June 85°F 30°C 65°F 19°C 4.0 in 101 mm 10
July 86°F 30°C 70°F 21°C 4.8 in 122 mm 7
August 81°F 27°C 64°F 18°C 3.5 in 88 mm 13
September 81°F 27°C 57°F 14°C 1.3 in 32 mm 16
October 70°F 21°C 50°F 10°C 1.6 in 40 mm 12
November 51°F 11°C 35°F 2°C 1.2 in 30 mm 9.9 in251 mm 10
December 34°F 1°C 19°F -7°C 1.5 in 38 mm 7.2 in183 mm 4

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 15 1
February 7 0
March 11 5
April 5 1
May 11 3
June 10 4
July 7 7
August 13 4
September 16 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