Strafford, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.2 °C (low) to 13.7 °C (high). Annual precipitation averages 1211.6 Millimeters. Strafford is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | -0.9 °C | 85.34 mm |
| February | -8.8 °C | 1 °C | 82.04 mm |
| March | -4.5 °C | 5.2 °C | 99.06 mm |
| April | 0.9 °C | 13.2 °C | 99.57 mm |
| May | 7.1 °C | 19.4 °C | 98.81 mm |
| June | 13.1 °C | 24.5 °C | 112.01 mm |
| July | 15.3 °C | 27.4 °C | 103.89 mm |
| August | 15.2 °C | 26.4 °C | 104.39 mm |
| September | 10.3 °C | 22.3 °C | 97.54 mm |
| October | 5.6 °C | 15.2 °C | 121.41 mm |
| November | -1 °C | 7.8 °C | 97.28 mm |
| December | -6.1 °C | 2.3 °C | 110.24 mm |
| Annual | 3.2 °C | 13.7 °C | 1211.58 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |