New Preston, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.6 °F (low) to 59.3 °F (high). Annual precipitation averages 49.9 Inches. New Preston is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.5 °F | 35.1 °F | 3.41 in. |
| February | 18.2 °F | 38.0 °F | 2.87 in. |
| March | 25.4 °F | 45.8 °F | 4.06 in. |
| April | 35.8 °F | 58.7 °F | 3.82 in. |
| May | 46.2 °F | 69.4 °F | 4.04 in. |
| June | 55.2 °F | 77.3 °F | 4.53 in. |
| July | 60.6 °F | 82.1 °F | 4.65 in. |
| August | 59.3 °F | 80.4 °F | 4.85 in. |
| September | 52.0 °F | 73.1 °F | 4.54 in. |
| October | 40.5 °F | 61.7 °F | 5.05 in. |
| November | 31.0 °F | 50.6 °F | 3.79 in. |
| December | 22.9 °F | 39.7 °F | 4.33 in. |
| Annual | 38.6 °F | 59.3 °F | 49.94 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |