New Haven, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.1 °C (low) to 20 °C (high). Annual precipitation averages 1286.2 Millimeters. New Haven is located in USDA Plant Hardiness Zone 7a. 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 | -3.7 °C | 6.7 °C | 93.22 mm |
| February | -2.5 °C | 9.1 °C | 96.77 mm |
| March | 1.3 °C | 14.3 °C | 121.16 mm |
| April | 6.5 °C | 20.4 °C | 119.63 mm |
| May | 11.7 °C | 25.2 °C | 138.68 mm |
| June | 16.2 °C | 29.7 °C | 124.97 mm |
| July | 18.3 °C | 31.1 °C | 111 mm |
| August | 17.4 °C | 30.8 °C | 89.66 mm |
| September | 13.6 °C | 27.8 °C | 91.69 mm |
| October | 6.4 °C | 21.4 °C | 96.52 mm |
| November | 1.6 °C | 14.3 °C | 89.66 mm |
| December | -1.4 °C | 8.7 °C | 113.28 mm |
| Annual | 7.1 °C | 20 °C | 1286.24 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |