Jewett, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 13.2 °C (high). Annual precipitation averages 1244.1 Millimeters. Jewett is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.4 °C | -0.2 °C | 86.87 mm |
| February | -10.7 °C | 1.4 °C | 69.85 mm |
| March | -7.1 °C | 5.3 °C | 99.57 mm |
| April | -0.8 °C | 12.4 °C | 101.35 mm |
| May | 5 °C | 19.2 °C | 101.35 mm |
| June | 9.9 °C | 23.5 °C | 119.38 mm |
| July | 12.4 °C | 25.8 °C | 107.19 mm |
| August | 11.5 °C | 24.9 °C | 109.22 mm |
| September | 7.8 °C | 21.3 °C | 124.46 mm |
| October | 2 °C | 14.7 °C | 131.83 mm |
| November | -2.8 °C | 8.1 °C | 91.95 mm |
| December | -7.4 °C | 2.3 °C | 101.09 mm |
| Annual | 0.7 °C | 13.2 °C | 1244.11 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |