Jasper, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 13.5 °C (high). Annual precipitation averages 956.8 Millimeters. Jasper is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | -0.2 °C | 60.96 mm |
| February | -9.3 °C | 0.8 °C | 46.23 mm |
| March | -5.5 °C | 5.6 °C | 67.31 mm |
| April | 0.4 °C | 12.7 °C | 78.49 mm |
| May | 6.5 °C | 19.7 °C | 87.88 mm |
| June | 11.2 °C | 24.1 °C | 104.14 mm |
| July | 13.3 °C | 26.4 °C | 94.74 mm |
| August | 12.5 °C | 25.7 °C | 91.95 mm |
| September | 8.5 °C | 22.1 °C | 96.77 mm |
| October | 3.2 °C | 15.1 °C | 92.96 mm |
| November | -1.6 °C | 8.1 °C | 71.63 mm |
| December | -6.2 °C | 2 °C | 63.75 mm |
| Annual | 1.9 °C | 13.5 °C | 956.81 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |