Port Chester, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.6 °F (low) to 61.5 °F (high). Annual precipitation averages 49 Inches. Port Chester 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 | 24.8 °F | 38.9 °F | 3.85 in. |
| February | 25.6 °F | 40.9 °F | 2.87 in. |
| March | 31.9 °F | 47.7 °F | 4.13 in. |
| April | 41.7 °F | 59.0 °F | 3.96 in. |
| May | 51.2 °F | 69.1 °F | 3.75 in. |
| June | 60.9 °F | 77.9 °F | 4.58 in. |
| July | 66.8 °F | 83.7 °F | 4.02 in. |
| August | 66.1 °F | 81.8 °F | 4.56 in. |
| September | 59.4 °F | 75.9 °F | 4.67 in. |
| October | 48.9 °F | 64.6 °F | 4.38 in. |
| November | 39.2 °F | 53.9 °F | 3.85 in. |
| December | 31.2 °F | 44.3 °F | 4.39 in. |
| Annual | 45.6 °F | 61.5 °F | 49.01 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |