New Haven, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.5 °F (low) to 60.2 °F (high). Annual precipitation averages 38.3 Inches. New Haven is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.5 °F | 32.4 °F | 2.48 in. |
| February | 19.3 °F | 35.9 °F | 2.05 in. |
| March | 27.9 °F | 46.9 °F | 2.52 in. |
| April | 38.1 °F | 60.4 °F | 3.74 in. |
| May | 49.6 °F | 71.7 °F | 4.48 in. |
| June | 59.8 °F | 80.7 °F | 4.11 in. |
| July | 62.8 °F | 84.5 °F | 3.91 in. |
| August | 60.6 °F | 82.4 °F | 3.88 in. |
| September | 53.1 °F | 76.7 °F | 3.0 in. |
| October | 42.2 °F | 64.0 °F | 2.84 in. |
| November | 32.0 °F | 49.4 °F | 2.93 in. |
| December | 23.2 °F | 37.4 °F | 2.32 in. |
| Annual | 40.5 °F | 60.2 °F | 38.26 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |