Epping, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 14.6 °C (high). Annual precipitation averages 1183.4 Millimeters. Epping 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 | -9.6 °C | 0.7 °C | 83.31 mm |
| February | -8.7 °C | 2.3 °C | 80.77 mm |
| March | -4.3 °C | 6.5 °C | 105.66 mm |
| April | 1.3 °C | 13.6 °C | 106.93 mm |
| May | 6.9 °C | 19.6 °C | 95.25 mm |
| June | 12.4 °C | 24.7 °C | 104.9 mm |
| July | 15.4 °C | 27.8 °C | 91.44 mm |
| August | 14.4 °C | 27.1 °C | 91.44 mm |
| September | 10.2 °C | 23 °C | 98.55 mm |
| October | 4.1 °C | 16.1 °C | 120.65 mm |
| November | -1 °C | 9.7 °C | 95.25 mm |
| December | -5.8 °C | 3.6 °C | 109.22 mm |
| Annual | 2.9 °C | 14.6 °C | 1183.37 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |