Wassaic, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.9 °F (low) to 60 °F (high). Annual precipitation averages 46.5 Inches. Wassaic is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 34.9 °F | 3.2 in. |
| February | 17.1 °F | 38.1 °F | 2.6 in. |
| March | 24.9 °F | 46.2 °F | 3.47 in. |
| April | 35.5 °F | 59.3 °F | 3.47 in. |
| May | 45.8 °F | 70.5 °F | 3.68 in. |
| June | 54.9 °F | 78.4 °F | 4.41 in. |
| July | 60.1 °F | 83.6 °F | 4.74 in. |
| August | 58.7 °F | 81.8 °F | 4.51 in. |
| September | 51.1 °F | 74.2 °F | 4.48 in. |
| October | 39.6 °F | 62.5 °F | 4.66 in. |
| November | 29.9 °F | 50.8 °F | 3.4 in. |
| December | 21.8 °F | 39.5 °F | 3.92 in. |
| Annual | 37.9 °F | 60 °F | 46.54 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |