Steeleville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.8 °C (low) to 19.3 °C (high). Annual precipitation averages 1129.5 Millimeters. Steeleville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °C | 4.9 °C | 71.63 mm |
| February | -2.7 °C | 7.7 °C | 66.29 mm |
| March | 1.7 °C | 13.3 °C | 99.31 mm |
| April | 7.4 °C | 19.7 °C | 128.27 mm |
| May | 13.3 °C | 24.8 °C | 129.54 mm |
| June | 18.2 °C | 29.7 °C | 114.55 mm |
| July | 20.2 °C | 31.3 °C | 99.57 mm |
| August | 18.8 °C | 30.8 °C | 75.44 mm |
| September | 14 °C | 27.3 °C | 85.85 mm |
| October | 7.6 °C | 21.2 °C | 81.79 mm |
| November | 2.1 °C | 13.3 °C | 99.31 mm |
| December | -2.6 °C | 7.1 °C | 77.98 mm |
| Annual | 7.8 °C | 19.3 °C | 1129.53 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°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 |