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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Explore on the MapMonthly Climate Chart
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
Water Temperatures
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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
↑ 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 |