Tappan, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 16.9 °C (high). Annual precipitation averages 1213.6 Millimeters. Tappan is located in USDA Plant Hardiness Zone 7a. 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 | -5.4 °C | 3.7 °C | 89.41 mm |
| February | -4.3 °C | 5.2 °C | 68.58 mm |
| March | -0.5 °C | 9.5 °C | 101.85 mm |
| April | 5.2 °C | 16.2 °C | 99.57 mm |
| May | 10.7 °C | 21.8 °C | 92.46 mm |
| June | 15.9 °C | 26.9 °C | 118.87 mm |
| July | 18.9 °C | 29.4 °C | 107.95 mm |
| August | 17.9 °C | 28.4 °C | 118.36 mm |
| September | 13.9 °C | 24.8 °C | 109.98 mm |
| October | 7.4 °C | 18.2 °C | 108.71 mm |
| November | 2.1 °C | 12.2 °C | 92.96 mm |
| December | -1.9 °C | 6.3 °C | 104.9 mm |
| Annual | 6.7 °C | 16.9 °C | 1213.6 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |