Swanton, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.7 °F (low) to 54.8 °F (high). Annual precipitation averages 40.3 Inches. Swanton 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 | 9.2 °F | 26.5 °F | 2.61 in. |
| February | 10.8 °F | 29.1 °F | 2.1 in. |
| March | 21.0 °F | 38.5 °F | 2.55 in. |
| April | 34.2 °F | 53.1 °F | 3.28 in. |
| May | 46.9 °F | 67.6 °F | 3.67 in. |
| June | 56.3 °F | 75.8 °F | 4.38 in. |
| July | 61.4 °F | 80.2 °F | 4.13 in. |
| August | 59.3 °F | 79.3 °F | 3.94 in. |
| September | 51.8 °F | 71.5 °F | 3.64 in. |
| October | 40.9 °F | 57.8 °F | 3.95 in. |
| November | 30.5 °F | 44.9 °F | 3.0 in. |
| December | 18.6 °F | 33.4 °F | 3.05 in. |
| Annual | 36.7 °F | 54.8 °F | 40.3 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |