Hunnewell, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 63.8 °F (high). Annual precipitation averages 41 Inches. Hunnewell is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.6 °F | 36.1 °F | 1.92 in. |
| February | 21.9 °F | 40.9 °F | 2.06 in. |
| March | 31.7 °F | 52.9 °F | 2.8 in. |
| April | 42.6 °F | 65.0 °F | 4.23 in. |
| May | 53.5 °F | 74.5 °F | 5.1 in. |
| June | 63.2 °F | 83.5 °F | 4.91 in. |
| July | 66.7 °F | 87.4 °F | 4.3 in. |
| August | 64.5 °F | 85.8 °F | 3.89 in. |
| September | 55.9 °F | 79.2 °F | 3.68 in. |
| October | 44.5 °F | 67.1 °F | 3.27 in. |
| November | 33.3 °F | 52.9 °F | 2.75 in. |
| December | 24.0 °F | 40.6 °F | 2.04 in. |
| Annual | 43.4 °F | 63.8 °F | 40.95 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |