Port Chester, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.6 °C (low) to 16.4 °C (high). Annual precipitation averages 1244.9 Millimeters. 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 | -4 °C | 3.8 °C | 97.79 mm |
| February | -3.6 °C | 4.9 °C | 72.9 mm |
| March | -0.1 °C | 8.7 °C | 104.9 mm |
| April | 5.4 °C | 15 °C | 100.58 mm |
| May | 10.7 °C | 20.6 °C | 95.25 mm |
| June | 16.1 °C | 25.5 °C | 116.33 mm |
| July | 19.3 °C | 28.7 °C | 102.11 mm |
| August | 18.9 °C | 27.7 °C | 115.82 mm |
| September | 15.2 °C | 24.4 °C | 118.62 mm |
| October | 9.4 °C | 18.1 °C | 111.25 mm |
| November | 4 °C | 12.2 °C | 97.79 mm |
| December | -0.4 °C | 6.8 °C | 111.51 mm |
| Annual | 7.6 °C | 16.4 °C | 1244.85 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 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 |