Rochester, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 12.7 °C (high). Annual precipitation averages 1229.6 Millimeters. Rochester is located in USDA Plant Hardiness Zone 5a. 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 | -13.3 °C | -2.3 °C | 83.31 mm |
| February | -13 °C | -0.6 °C | 72.64 mm |
| March | -8.1 °C | 4.2 °C | 92.71 mm |
| April | -1.2 °C | 12 °C | 96.27 mm |
| May | 5 °C | 19.4 °C | 100.84 mm |
| June | 10.2 °C | 23.9 °C | 136.4 mm |
| July | 12.9 °C | 26.4 °C | 121.67 mm |
| August | 12.2 °C | 25.5 °C | 112.52 mm |
| September | 7.9 °C | 21.7 °C | 99.82 mm |
| October | 2 °C | 14.3 °C | 123.95 mm |
| November | -3.2 °C | 7.1 °C | 88.14 mm |
| December | -9 °C | 0.8 °C | 101.35 mm |
| Annual | 0.2 °C | 12.7 °C | 1229.62 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 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 |