Manchester, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.4 °C (low) to 14.2 °C (high). Annual precipitation averages 903 Millimeters. Manchester is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 0.2 °C | 59.94 mm |
| February | -7.3 °C | 1.1 °C | 48.01 mm |
| March | -3.7 °C | 5.7 °C | 65.79 mm |
| April | 2.3 °C | 13.1 °C | 74.93 mm |
| May | 8.6 °C | 20.2 °C | 77.98 mm |
| June | 13.9 °C | 25 °C | 89.66 mm |
| July | 16.5 °C | 27.4 °C | 95 mm |
| August | 15.7 °C | 26.7 °C | 86.11 mm |
| September | 11.7 °C | 22.7 °C | 82.55 mm |
| October | 6 °C | 15.9 °C | 89.15 mm |
| November | 0.7 °C | 9.1 °C | 68.58 mm |
| December | -4.1 °C | 3.2 °C | 65.28 mm |
| Annual | 4.4 °C | 14.2 °C | 902.98 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |