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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Explore on the MapMonthly Climate Chart
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
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →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
↑ See chart| 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 |