Calumet Park, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 15.5 °C (high). Annual precipitation averages 1011.4 Millimeters. Calumet Park is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 0.3 °C | 55.88 mm |
| February | -6.2 °C | 2.3 °C | 53.09 mm |
| March | -1.1 °C | 8.1 °C | 60.45 mm |
| April | 4.6 °C | 15.1 °C | 98.55 mm |
| May | 10.6 °C | 21.1 °C | 115.32 mm |
| June | 16.2 °C | 26.7 °C | 112.27 mm |
| July | 19.3 °C | 29.1 °C | 111.51 mm |
| August | 18.2 °C | 28.1 °C | 105.92 mm |
| September | 14.2 °C | 24.6 °C | 82.55 mm |
| October | 7.3 °C | 17.4 °C | 89.15 mm |
| November | 1.2 °C | 9.6 °C | 68.07 mm |
| December | -4.4 °C | 3.1 °C | 58.67 mm |
| Annual | 6 °C | 15.5 °C | 1011.43 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |