Rockdale, Illinois Climate
United States
Pop. 1,948 Elev. 168 m / 551 ft
TZ: America/Chicago (UTC-5) ·
Dry and warm, Rockdale sees July highs of 86°F (30°C) and cold January lows of 16°F (-9°C). Humidity pushes the summer feels-like temperature to 96°F (36°C), while wind chill can drive winter lows to 7°F (-14°C). Expect around 46 rainy days annually (34.1 in / 865 mm total), with snow on 5 days and 36 in (903 mm) of annual accumulation. The city averages 112 sunny days per year and around 35 thunderstorm days. Ocean water temperatures reach 77°F (25°C) in summer.
| Temperature | 86°F (30°C) high | 16°F (-9°C) low |
| Feels like | 96°F (36°C) high | 7°F (-14°C) low |
| Rain | 46 days | 34.1 in (865 mm) /yr |
| Snow | 5 days | 35.6 in (903 mm) /yr |
| Sky | 112 sunny | 35 stormy |
| Wind | 2.7 mph (1.2 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Apr, Aug, Sep
Sky & Air by Month
Cloud cover (%)
56
Jan 64
Feb 56
Mar 67
Apr 62
May 54
Jun 63
Jul 53
Aug 35
Sep 47
Oct 58
Nov 76
Dec Humidity (%)
61
Jan 65
Feb 59
Mar 60
Apr 66
May 67
Jun 73
Jul 73
Aug 67
Sep 65
Oct 67
Nov 76
Dec Weather Days by Month
Water Temperatures
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Nearby
Commercial airport 27 mi Chicago Midway International Airport (MDW)
Ski resort 19 mi
National park 29 mi Historic Pullman Foundation Exhibit Hall
Hospital 2 mi Saint Joseph Medical Center
Hiking trail 14 mi Orange Unpaved Spur
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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 | 0.6 in 16 mm | 6.0 in151 mm | 14 |
| February | 36°F 2°C | 21°F -6°C | 0.2 in 5 mm | 7.1 in181 mm | 6 |
| March | 58°F 15°C | 37°F 3°C | 3.9 in 99 mm | 4.2 in108 mm | 12 |
| April | 62°F 17°C | 44°F 6°C | 3.1 in 79 mm | 0.1 in3 mm | 6 |
| May | 69°F 20°C | 51°F 10°C | 4.3 in 110 mm | — | 8 |
| June | 84°F 29°C | 65°F 18°C | 5.5 in 140 mm | — | 10 |
| July | 86°F 30°C | 70°F 21°C | 4.7 in 119 mm | — | 5 |
| August | 81°F 27°C | 64°F 18°C | 3.6 in 92 mm | — | 9 |
| September | 79°F 26°C | 57°F 14°C | 1.5 in 37 mm | — | 17 |
| October | 67°F 20°C | 49°F 10°C | 3.7 in 94 mm | — | 13 |
| November | 51°F 10°C | 36°F 2°C | 1.1 in 28 mm | 10.3 in262 mm | 9 |
| December | 36°F 2°C | 21°F -6°C | 1.9 in 47 mm | 7.8 in198 mm | 3 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 1 |
| February | 6 | 0 |
| March | 12 | 5 |
| April | 6 | 2 |
| May | 8 | 4 |
| June | 10 | 5 |
| July | 5 | 6 |
| August | 9 | 6 |
| September | 17 | 3 |
| October | 13 | 2 |
| November | 9 | 0 |
| December | 3 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 36°F 2°C | 32°F 0°C |
| February | 33°F 1°C | 32°F 0°C |
| March | 38°F 4°C | 40°F 4°C |
| April | 47°F 8°C | 49°F 10°C |
| May | 54°F 12°C | 57°F 14°C |
| June | 71°F 22°C | 70°F 21°C |
| July | 76°F 25°C | 78°F 25°C |
| August | 77°F 25°C | 74°F 23°C |
| September | 69°F 21°C | 68°F 20°C |
| October | 66°F 19°C | 59°F 15°C |
| November | 53°F 12°C | 44°F 6°C |
| December | 43°F 6°C | 33°F 1°C |