Radom, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 18.6 °C (high). Annual precipitation averages 1144 Millimeters. Radom is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 3.9 °C | 74.17 mm |
| February | -3.3 °C | 6.7 °C | 66.04 mm |
| March | 1.4 °C | 12.4 °C | 95 mm |
| April | 7.2 °C | 19.1 °C | 124.21 mm |
| May | 13.1 °C | 24.1 °C | 129.03 mm |
| June | 17.9 °C | 29.1 °C | 123.7 mm |
| July | 19.8 °C | 30.8 °C | 104.14 mm |
| August | 18.5 °C | 30.2 °C | 81.53 mm |
| September | 13.9 °C | 26.9 °C | 84.84 mm |
| October | 7.7 °C | 20.6 °C | 84.58 mm |
| November | 1.9 °C | 12.6 °C | 100.08 mm |
| December | -2.7 °C | 6.3 °C | 76.71 mm |
| Annual | 7.5 °C | 18.6 °C | 1144.03 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |