Champlain, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 12.4 °C (high). Annual precipitation averages 1003.6 Millimeters. Champlain 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 | -13.1 °C | -3.6 °C | 68.58 mm |
| February | -12.2 °C | -2.1 °C | 54.1 mm |
| March | -6.4 °C | 3.2 °C | 61.21 mm |
| April | 1.2 °C | 11.7 °C | 83.06 mm |
| May | 7.9 °C | 19.6 °C | 88.9 mm |
| June | 13.3 °C | 24.2 °C | 104.9 mm |
| July | 15.9 °C | 26.7 °C | 100.84 mm |
| August | 14.7 °C | 25.8 °C | 97.79 mm |
| September | 10.6 °C | 21.8 °C | 87.12 mm |
| October | 4.4 °C | 14.2 °C | 102.87 mm |
| November | -1.3 °C | 6.9 °C | 74.68 mm |
| December | -8.1 °C | 0.3 °C | 79.5 mm |
| Annual | 2.2 °C | 12.4 °C | 1003.55 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 |