Prospect, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12.1 °C (high). Annual precipitation averages 1343.4 Millimeters. Prospect is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.7 °C | -2.6 °C | 95.25 mm |
| February | -11.8 °C | -1.2 °C | 89.41 mm |
| March | -7.5 °C | 3.4 °C | 102.36 mm |
| April | -0.4 °C | 11.4 °C | 99.57 mm |
| May | 6.2 °C | 19.1 °C | 125.22 mm |
| June | 11.2 °C | 23.3 °C | 126.24 mm |
| July | 13.9 °C | 25.7 °C | 122.94 mm |
| August | 13.1 °C | 24.8 °C | 111 mm |
| September | 9 °C | 20.9 °C | 121.16 mm |
| October | 3.2 °C | 13.7 °C | 133.86 mm |
| November | -2.3 °C | 6.6 °C | 109.47 mm |
| December | -8 °C | 0.3 °C | 106.93 mm |
| Annual | 1.2 °C | 12.1 °C | 1343.41 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |