New Milford, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 15.9 °C (high). Annual precipitation averages 1244.1 Millimeters. New Milford is located in USDA Plant Hardiness Zone 6b. 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 | -8.1 °C | 2 °C | 86.61 mm |
| February | -7.1 °C | 3.8 °C | 71.37 mm |
| March | -2.9 °C | 8.2 °C | 97.03 mm |
| April | 2.7 °C | 15.6 °C | 97.28 mm |
| May | 8.6 °C | 21.6 °C | 97.03 mm |
| June | 13.6 °C | 26.3 °C | 115.82 mm |
| July | 16.6 °C | 29.1 °C | 111.76 mm |
| August | 15.8 °C | 28 °C | 123.44 mm |
| September | 11.5 °C | 23.9 °C | 115.32 mm |
| October | 4.9 °C | 17.3 °C | 125.98 mm |
| November | -0.5 °C | 10.8 °C | 96.27 mm |
| December | -4.7 °C | 4.6 °C | 106.17 mm |
| Annual | 4.2 °C | 15.9 °C | 1244.08 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |