New Fairfield, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40 °F (low) to 58.7 °F (high). Annual precipitation averages 51.1 Inches. New Fairfield is located in USDA Plant Hardiness Zone 6b. 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 | 17.5 °F | 34.4 °F | 3.76 in. |
| February | 19.3 °F | 37.5 °F | 2.93 in. |
| March | 26.5 °F | 45.7 °F | 4.05 in. |
| April | 37.3 °F | 58.2 °F | 3.94 in. |
| May | 47.7 °F | 68.3 °F | 3.78 in. |
| June | 56.8 °F | 76.3 °F | 4.62 in. |
| July | 62.0 °F | 81.4 °F | 4.86 in. |
| August | 60.7 °F | 79.4 °F | 5.02 in. |
| September | 53.6 °F | 72.4 °F | 4.79 in. |
| October | 42.3 °F | 61.0 °F | 4.88 in. |
| November | 32.6 °F | 50.2 °F | 4.07 in. |
| December | 23.9 °F | 39.2 °F | 4.35 in. |
| Annual | 40 °F | 58.7 °F | 51.05 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 6b : -5°F to 0°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 |