Gilman, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.4 °F (low) to 53.8 °F (high). Annual precipitation averages 38 Inches. Gilman is located in USDA Plant Hardiness Zone 4b. 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 | 4.6 °F | 25.9 °F | 2.13 in. |
| February | 5.6 °F | 29.6 °F | 2.04 in. |
| March | 16.1 °F | 38.8 °F | 2.05 in. |
| April | 29.6 °F | 52.4 °F | 2.9 in. |
| May | 41.1 °F | 66.1 °F | 3.72 in. |
| June | 50.4 °F | 74.5 °F | 3.86 in. |
| July | 55.4 °F | 79.2 °F | 3.94 in. |
| August | 53.6 °F | 77.7 °F | 4.03 in. |
| September | 46.0 °F | 70.3 °F | 3.48 in. |
| October | 35.3 °F | 56.5 °F | 3.92 in. |
| November | 25.6 °F | 43.2 °F | 2.78 in. |
| December | 14.0 °F | 31.5 °F | 3.11 in. |
| Annual | 31.4 °F | 53.8 °F | 37.96 in. |
| 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |