Franklin, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.3 °C (low) to 11.9 °C (high). Annual precipitation averages 1115.1 Millimeters. Franklin 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 | -14 °C | -3.7 °C | 73.91 mm |
| February | -12.9 °C | -2.2 °C | 58.17 mm |
| March | -7.3 °C | 3.1 °C | 72.64 mm |
| April | 0.1 °C | 11.2 °C | 86.11 mm |
| May | 6.8 °C | 18.9 °C | 97.03 mm |
| June | 11.9 °C | 23.6 °C | 111.51 mm |
| July | 14.6 °C | 25.8 °C | 119.89 mm |
| August | 13.6 °C | 25.2 °C | 114.05 mm |
| September | 9.5 °C | 21.1 °C | 103.12 mm |
| October | 3.7 °C | 13.7 °C | 108.71 mm |
| November | -2.1 °C | 6.7 °C | 83.31 mm |
| December | -8.9 °C | -0.1 °C | 86.61 mm |
| Annual | 1.3 °C | 11.9 °C | 1115.06 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |