Green Rock, Illinois Climate

United States

Pop. 2,970 Elev. 182 m / 597 ft TZ: America/Chicago (UTC-5) ·

Dry and warm, Green Rock sees July highs of 87°F (31°C) and cold January lows of 16°F (-9°C). Humidity pushes the summer feels-like temperature to 98°F (37°C), while wind chill can drive winter lows to 7°F (-14°C). Expect around 38 rainy days annually (30.9 in / 786 mm total), with snow on 4 days and 31 in (800 mm) of annual accumulation. The city averages 130 sunny days per year and around 27 thunderstorm days. Nearby lake water reaches 77°F (25°C) in summer.

Temperature 87°F (30°C) high 16°F (-9°C) low
Feels like 98°F (37°C) high 7°F (-14°C) low
Rain 38 days 30.9 in (786 mm) /yr
Snow 4 days 31.5 in (800 mm) /yr
Sky 130 sunny 27 stormy
Wind 2.6 mph (1.1 m/s) avg

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Monthly Climate Chart

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

Sky & Air by Month

Cloud cover (%)
50
Jan
59
Feb
51
Mar
68
Apr
56
May
53
Jun
61
Jul
51
Aug
41
Sep
45
Oct
54
Nov
72
Dec
Humidity (%)
62
Jan
66
Feb
59
Mar
60
Apr
58
May
65
Jun
73
Jul
74
Aug
61
Sep
60
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 8 mi Quad City International Airport (MLI)
Ski resort 58 mi Chestnut Mountain Resort
National park 114 mi Pikes Peak State Park
Hospital 3 mi Genesis Medical Center, Silvis
Hiking trail 20 mi ADT - Illinois - I - Seg 3

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 31°F 0°C 16°F -9°C 1.3 in 33 mm 3.1 in78 mm 15
February 35°F 2°C 19°F -7°C 0.1 in 3 mm 5.8 in147 mm 9
March 58°F 14°C 36°F 2°C 3.9 in 98 mm 6.3 in161 mm 13
April 64°F 18°C 45°F 7°C 4.0 in 102 mm 5
May 73°F 23°C 52°F 11°C 3.4 in 86 mm 11
June 85°F 29°C 66°F 19°C 5.0 in 128 mm 10
July 87°F 30°C 71°F 22°C 5.4 in 137 mm 7
August 81°F 27°C 64°F 18°C 2.9 in 73 mm 15
September 81°F 27°C 58°F 14°C 1.0 in 25 mm 17
October 70°F 21°C 50°F 10°C 1.4 in 36 mm 12
November 52°F 11°C 36°F 2°C 1.2 in 31 mm 9.1 in231 mm 10
December 34°F 1°C 19°F -7°C 1.3 in 34 mm 7.2 in183 mm 6

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 15 1
February 9 0
March 13 3
April 5 2
May 11 3
June 10 4
July 7 5
August 15 4
September 17 2
October 12 1
November 10 1
December 6 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