Mount Vernon, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8.2 °C (low) to 16.9 °C (high). Annual precipitation averages 1225.1 Millimeters. Mount Vernon is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 3.9 °C | 93.22 mm |
| February | -3 °C | 5.3 °C | 72.39 mm |
| March | 0.6 °C | 9.3 °C | 104.39 mm |
| April | 6.2 °C | 15.9 °C | 98.81 mm |
| May | 11.6 °C | 21.5 °C | 95.25 mm |
| June | 16.9 °C | 26.5 °C | 117.35 mm |
| July | 20.2 °C | 29.3 °C | 106.93 mm |
| August | 19.6 °C | 28.2 °C | 114.05 mm |
| September | 15.9 °C | 24.8 °C | 113.03 mm |
| October | 9.7 °C | 18.3 °C | 106.68 mm |
| November | 4.3 °C | 12.3 °C | 92.46 mm |
| December | -0.1 °C | 6.9 °C | 110.49 mm |
| Annual | 8.2 °C | 16.9 °C | 1225.05 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |