Hardin, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 64.6 °F (high). Annual precipitation averages 42.2 Inches. Hardin 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 | 18.1 °F | 37.8 °F | 1.44 in. |
| February | 22.3 °F | 43.3 °F | 1.86 in. |
| March | 31.6 °F | 54.3 °F | 2.78 in. |
| April | 42.0 °F | 65.3 °F | 4.21 in. |
| May | 52.9 °F | 75.0 °F | 5.55 in. |
| June | 62.8 °F | 83.7 °F | 5.32 in. |
| July | 66.7 °F | 87.6 °F | 4.77 in. |
| August | 64.2 °F | 86.6 °F | 4.37 in. |
| September | 55.3 °F | 79.0 °F | 4.37 in. |
| October | 43.4 °F | 67.7 °F | 3.4 in. |
| November | 32.3 °F | 53.5 °F | 2.37 in. |
| December | 22.9 °F | 41.9 °F | 1.77 in. |
| Annual | 42.9 °F | 64.6 °F | 42.21 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |