Hartville, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.4 °F (low) to 67.1 °F (high). Annual precipitation averages 46.2 Inches. Hartville is located in USDA Plant Hardiness Zone 7a. 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 | 22.6 °F | 43.3 °F | 2.73 in. |
| February | 26.3 °F | 48.1 °F | 2.78 in. |
| March | 33.9 °F | 57.3 °F | 4.15 in. |
| April | 43.7 °F | 68.1 °F | 5.03 in. |
| May | 53.1 °F | 75.5 °F | 5.49 in. |
| June | 61.8 °F | 83.5 °F | 4.18 in. |
| July | 65.7 °F | 88.1 °F | 4.17 in. |
| August | 64.1 °F | 87.6 °F | 3.44 in. |
| September | 56.0 °F | 80.5 °F | 3.97 in. |
| October | 44.4 °F | 69.5 °F | 3.42 in. |
| November | 34.3 °F | 57.1 °F | 3.96 in. |
| December | 26.5 °F | 46.3 °F | 2.89 in. |
| Annual | 44.4 °F | 67.1 °F | 46.21 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |