Tappan, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44 °F (low) to 62.4 °F (high). Annual precipitation averages 47.8 Inches. 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 | 22.3 °F | 38.6 °F | 3.52 in. |
| February | 24.3 °F | 41.4 °F | 2.7 in. |
| March | 31.1 °F | 49.1 °F | 4.01 in. |
| April | 41.4 °F | 61.2 °F | 3.92 in. |
| May | 51.3 °F | 71.3 °F | 3.64 in. |
| June | 60.7 °F | 80.4 °F | 4.68 in. |
| July | 66.0 °F | 85.0 °F | 4.25 in. |
| August | 64.3 °F | 83.1 °F | 4.66 in. |
| September | 57.0 °F | 76.7 °F | 4.33 in. |
| October | 45.3 °F | 64.7 °F | 4.28 in. |
| November | 35.7 °F | 53.9 °F | 3.66 in. |
| December | 28.6 °F | 43.4 °F | 4.13 in. |
| Annual | 44 °F | 62.4 °F | 47.78 in. |
| 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 : 0°F to 5°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 |