Chaumont, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 12.6 °C (high). Annual precipitation averages 1026.7 Millimeters. Chaumont 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 | -11.4 °C | -1.9 °C | 88.14 mm |
| February | -11.1 °C | -1 °C | 67.31 mm |
| March | -5.7 °C | 3.7 °C | 69.6 mm |
| April | 1.4 °C | 11.4 °C | 85.34 mm |
| May | 7.8 °C | 18.4 °C | 80.26 mm |
| June | 13.3 °C | 23.3 °C | 85.34 mm |
| July | 16.4 °C | 26.1 °C | 77.72 mm |
| August | 15.5 °C | 25.5 °C | 83.31 mm |
| September | 11.3 °C | 21.7 °C | 90.68 mm |
| October | 5.4 °C | 14.6 °C | 112.01 mm |
| November | -0.3 °C | 8 °C | 95.25 mm |
| December | -6.3 °C | 1.6 °C | 91.69 mm |
| Annual | 3 °C | 12.6 °C | 1026.65 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |