Eastford, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 14.9 °C (high). Annual precipitation averages 1171.4 Millimeters. Eastford 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 | -8.3 °C | 1.8 °C | 85.34 mm |
| February | -7.9 °C | 3.2 °C | 76.45 mm |
| March | -3.7 °C | 7.4 °C | 102.36 mm |
| April | 1.9 °C | 14.3 °C | 96.01 mm |
| May | 7.5 °C | 20.1 °C | 86.61 mm |
| June | 12.7 °C | 24.6 °C | 101.85 mm |
| July | 15.9 °C | 27.4 °C | 97.28 mm |
| August | 14.9 °C | 26.4 °C | 108.97 mm |
| September | 11 °C | 22.7 °C | 105.16 mm |
| October | 4.7 °C | 16.3 °C | 116.33 mm |
| November | -0.4 °C | 10.3 °C | 90.17 mm |
| December | -4.9 °C | 4.7 °C | 104.9 mm |
| Annual | 3.6 °C | 14.9 °C | 1171.43 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 | Dfb - Humid Continental Mild Summer, Wet All Year |