Brandon, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 13.6 °C (high). Annual precipitation averages 1012.2 Millimeters. Brandon 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 | -11.9 °C | -1.6 °C | 60.71 mm |
| February | -11.4 °C | 0.1 °C | 47.75 mm |
| March | -6.1 °C | 5.1 °C | 61.21 mm |
| April | 0.3 °C | 13.3 °C | 80.01 mm |
| May | 6.8 °C | 20.2 °C | 95.25 mm |
| June | 12.1 °C | 25.2 °C | 104.65 mm |
| July | 14.8 °C | 27.6 °C | 118.36 mm |
| August | 14 °C | 26.7 °C | 103.12 mm |
| September | 9.7 °C | 22.7 °C | 91.44 mm |
| October | 3.4 °C | 14.8 °C | 100.84 mm |
| November | -1.6 °C | 7.9 °C | 72.9 mm |
| December | -7.5 °C | 1.6 °C | 75.95 mm |
| Annual | 1.9 °C | 13.6 °C | 1012.19 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |