Harpersfield, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.8 °F (low) to 55.1 °F (high). Annual precipitation averages 45 Inches. Harpersfield 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 | 12.9 °F | 30.5 °F | 2.93 in. |
| February | 13.7 °F | 32.6 °F | 2.4 in. |
| March | 21.1 °F | 41.1 °F | 3.22 in. |
| April | 31.5 °F | 54.2 °F | 3.83 in. |
| May | 41.4 °F | 66.2 °F | 3.89 in. |
| June | 51.2 °F | 73.4 °F | 4.42 in. |
| July | 55.7 °F | 77.6 °F | 4.48 in. |
| August | 54.5 °F | 76.4 °F | 4.44 in. |
| September | 48.0 °F | 70.2 °F | 4.01 in. |
| October | 38.3 °F | 58.3 °F | 4.33 in. |
| November | 28.4 °F | 45.4 °F | 3.57 in. |
| December | 20.3 °F | 35.3 °F | 3.45 in. |
| Annual | 34.8 °F | 55.1 °F | 44.97 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |