New Haven, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.6 °F (low) to 66 °F (high). Annual precipitation averages 44.2 Inches. New Haven is located in USDA Plant Hardiness Zone 6b. 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 | 21.2 °F | 40.0 °F | 2.5 in. |
| February | 24.7 °F | 45.3 °F | 2.4 in. |
| March | 33.3 °F | 55.5 °F | 3.49 in. |
| April | 43.8 °F | 67.4 °F | 4.69 in. |
| May | 54.3 °F | 75.8 °F | 5.33 in. |
| June | 63.3 °F | 83.9 °F | 4.53 in. |
| July | 67.4 °F | 88.0 °F | 4.21 in. |
| August | 65.1 °F | 87.0 °F | 3.85 in. |
| September | 56.8 °F | 80.3 °F | 3.77 in. |
| October | 45.0 °F | 68.9 °F | 3.33 in. |
| November | 34.3 °F | 55.5 °F | 3.45 in. |
| December | 25.7 °F | 44.1 °F | 2.66 in. |
| Annual | 44.6 °F | 66 °F | 44.21 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |