Harrison, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46.1 °F (low) to 61.7 °F (high). Annual precipitation averages 48.3 Inches. Harrison is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.0 °F | 39.1 °F | 3.74 in. |
| February | 26.0 °F | 41.2 °F | 2.84 in. |
| March | 32.6 °F | 47.9 °F | 4.1 in. |
| April | 42.3 °F | 59.2 °F | 3.86 in. |
| May | 51.9 °F | 69.8 °F | 3.69 in. |
| June | 61.7 °F | 78.3 °F | 4.62 in. |
| July | 67.6 °F | 83.6 °F | 4.06 in. |
| August | 66.6 °F | 82.2 °F | 4.48 in. |
| September | 59.9 °F | 76.0 °F | 4.57 in. |
| October | 48.7 °F | 64.8 °F | 4.22 in. |
| November | 39.3 °F | 54.1 °F | 3.78 in. |
| December | 31.4 °F | 44.5 °F | 4.36 in. |
| Annual | 46.1 °F | 61.7 °F | 48.32 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |