Mastic, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 43.7 °F (low) to 60.9 °F (high). Annual precipitation averages 47 Inches. Mastic is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.1 °F | 39.3 °F | 3.8 in. |
| February | 24.2 °F | 40.9 °F | 3.43 in. |
| March | 30.4 °F | 47.4 °F | 4.83 in. |
| April | 39.4 °F | 57.9 °F | 4.18 in. |
| May | 49.2 °F | 67.7 °F | 3.48 in. |
| June | 58.9 °F | 76.7 °F | 3.87 in. |
| July | 65.2 °F | 82.4 °F | 3.09 in. |
| August | 64.2 °F | 81.2 °F | 3.68 in. |
| September | 57.5 °F | 74.8 °F | 3.52 in. |
| October | 46.5 °F | 63.8 °F | 4.63 in. |
| November | 36.6 °F | 53.9 °F | 3.76 in. |
| December | 28.9 °F | 44.6 °F | 4.68 in. |
| Annual | 43.7 °F | 60.9 °F | 46.95 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |