Hermon, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35 °F (low) to 54.5 °F (high). Annual precipitation averages 41.9 Inches. Hermon is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.1 °F | 26.6 °F | 3.08 in. |
| February | 9.1 °F | 29.2 °F | 2.39 in. |
| March | 19.3 °F | 38.4 °F | 2.73 in. |
| April | 33.0 °F | 53.2 °F | 3.44 in. |
| May | 45.1 °F | 66.7 °F | 3.56 in. |
| June | 54.6 °F | 75.0 °F | 4.16 in. |
| July | 59.4 °F | 79.5 °F | 3.9 in. |
| August | 57.4 °F | 78.3 °F | 3.53 in. |
| September | 49.5 °F | 71.0 °F | 3.75 in. |
| October | 38.8 °F | 57.6 °F | 4.55 in. |
| November | 28.6 °F | 45.1 °F | 3.56 in. |
| December | 16.9 °F | 32.9 °F | 3.2 in. |
| Annual | 35 °F | 54.5 °F | 41.85 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |