Mount Vernon, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46.7 °F (low) to 62.4 °F (high). Annual precipitation averages 48.2 Inches. 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 | 25.3 °F | 39.0 °F | 3.67 in. |
| February | 26.6 °F | 41.5 °F | 2.85 in. |
| March | 33.1 °F | 48.8 °F | 4.11 in. |
| April | 43.1 °F | 60.7 °F | 3.89 in. |
| May | 52.9 °F | 70.7 °F | 3.75 in. |
| June | 62.5 °F | 79.7 °F | 4.62 in. |
| July | 68.4 °F | 84.8 °F | 4.21 in. |
| August | 67.2 °F | 82.8 °F | 4.49 in. |
| September | 60.7 °F | 76.7 °F | 4.45 in. |
| October | 49.5 °F | 65.0 °F | 4.2 in. |
| November | 39.8 °F | 54.2 °F | 3.64 in. |
| December | 31.8 °F | 44.4 °F | 4.35 in. |
| Annual | 46.7 °F | 62.4 °F | 48.23 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |