Steeleville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46 °F (low) to 66.7 °F (high). Annual precipitation averages 44.5 Inches. 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 | 23.5 °F | 40.8 °F | 2.82 in. |
| February | 27.1 °F | 45.9 °F | 2.61 in. |
| March | 35.1 °F | 56.0 °F | 3.91 in. |
| April | 45.3 °F | 67.5 °F | 5.05 in. |
| May | 55.9 °F | 76.7 °F | 5.1 in. |
| June | 64.8 °F | 85.5 °F | 4.51 in. |
| July | 68.3 °F | 88.4 °F | 3.92 in. |
| August | 65.8 °F | 87.4 °F | 2.97 in. |
| September | 57.2 °F | 81.2 °F | 3.38 in. |
| October | 45.6 °F | 70.2 °F | 3.22 in. |
| November | 35.7 °F | 56.0 °F | 3.91 in. |
| December | 27.4 °F | 44.7 °F | 3.07 in. |
| Annual | 46 °F | 66.7 °F | 44.47 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |