Harrietstown, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.7 °F (low) to 52.3 °F (high). Annual precipitation averages 46.7 Inches. Harrietstown is located in USDA Plant Hardiness Zone 4a. 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 | 5.5 °F | 26.0 °F | 3.34 in. |
| February | 6.9 °F | 29.0 °F | 2.55 in. |
| March | 15.2 °F | 37.4 °F | 3.07 in. |
| April | 28.4 °F | 50.6 °F | 3.69 in. |
| May | 39.7 °F | 63.9 °F | 4.08 in. |
| June | 49.3 °F | 72.6 °F | 4.84 in. |
| July | 53.9 °F | 76.7 °F | 4.55 in. |
| August | 52.1 °F | 75.0 °F | 4.32 in. |
| September | 44.7 °F | 68.5 °F | 4.05 in. |
| October | 35.0 °F | 54.6 °F | 4.8 in. |
| November | 24.9 °F | 42.1 °F | 3.76 in. |
| December | 13.3 °F | 31.2 °F | 3.6 in. |
| Annual | 30.7 °F | 52.3 °F | 46.65 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°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 |