Gilford, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 52.6 °F (high). Annual precipitation averages 53.2 Inches. Gilford is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.2 °F | 27.2 °F | 3.34 in. |
| February | 11.5 °F | 29.9 °F | 3.82 in. |
| March | 19.4 °F | 38.0 °F | 3.93 in. |
| April | 30.1 °F | 51.0 °F | 4.02 in. |
| May | 40.5 °F | 63.4 °F | 3.96 in. |
| June | 50.0 °F | 71.6 °F | 5.29 in. |
| July | 55.3 °F | 76.8 °F | 4.95 in. |
| August | 54.0 °F | 75.2 °F | 4.28 in. |
| September | 47.1 °F | 68.0 °F | 4.61 in. |
| October | 36.8 °F | 54.9 °F | 5.83 in. |
| November | 26.9 °F | 42.8 °F | 4.45 in. |
| December | 17.7 °F | 32.8 °F | 4.76 in. |
| Annual | 33.4 °F | 52.6 °F | 53.24 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |