Melville, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.4 °C (low) to 16.6 °C (high). Annual precipitation averages 1191.8 Millimeters. Melville 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 | -3.9 °C | 4.2 °C | 96.01 mm |
| February | -3.3 °C | 5.6 °C | 79.5 mm |
| March | 0.1 °C | 9.6 °C | 111.25 mm |
| April | 5.1 °C | 15.4 °C | 104.9 mm |
| May | 10.4 °C | 20.8 °C | 88.39 mm |
| June | 15.9 °C | 25.8 °C | 100.58 mm |
| July | 19.3 °C | 28.6 °C | 84.33 mm |
| August | 18.7 °C | 27.6 °C | 106.43 mm |
| September | 15 °C | 24 °C | 99.57 mm |
| October | 8.8 °C | 17.8 °C | 117.86 mm |
| November | 3.4 °C | 12.1 °C | 89.15 mm |
| December | -0.7 °C | 7.2 °C | 113.79 mm |
| Annual | 7.4 °C | 16.6 °C | 1191.76 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |