Jacksonville, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 12.3 °C (high). Annual precipitation averages 1454.2 Millimeters. Jacksonville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.2 °C | -1.5 °C | 103.38 mm |
| February | -12.2 °C | -0.2 °C | 94.74 mm |
| March | -7.7 °C | 4.1 °C | 113.54 mm |
| April | -1.2 °C | 11.2 °C | 115.32 mm |
| May | 5 °C | 17.9 °C | 115.82 mm |
| June | 10 °C | 22.9 °C | 138.94 mm |
| July | 12.8 °C | 25.3 °C | 123.44 mm |
| August | 11.7 °C | 24.7 °C | 117.6 mm |
| September | 7.4 °C | 20.9 °C | 132.59 mm |
| October | 1.6 °C | 13.8 °C | 153.42 mm |
| November | -3.2 °C | 7.1 °C | 114.05 mm |
| December | -8.5 °C | 1.1 °C | 131.32 mm |
| Annual | 0.3 °C | 12.3 °C | 1454.16 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |