Steelville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 67.1 °F (high). Annual precipitation averages 45.4 Inches. Steelville is located in USDA Plant Hardiness Zone 6a. 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 | 19.5 °F | 41.6 °F | 2.67 in. |
| February | 22.8 °F | 47.4 °F | 2.55 in. |
| March | 30.5 °F | 56.9 °F | 3.89 in. |
| April | 40.8 °F | 69.0 °F | 4.9 in. |
| May | 50.6 °F | 76.7 °F | 5.15 in. |
| June | 60.4 °F | 84.7 °F | 4.41 in. |
| July | 64.1 °F | 88.6 °F | 4.26 in. |
| August | 62.1 °F | 87.9 °F | 3.98 in. |
| September | 53.6 °F | 80.5 °F | 3.99 in. |
| October | 41.7 °F | 69.6 °F | 3.14 in. |
| November | 31.5 °F | 56.5 °F | 3.78 in. |
| December | 23.6 °F | 45.5 °F | 2.71 in. |
| Annual | 41.8 °F | 67.1 °F | 45.43 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |