Lowell, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.4 °C (low) to 11.3 °C (high). Annual precipitation averages 1279.9 Millimeters. Lowell is located in USDA Plant Hardiness Zone 4b. 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 | -15.6 °C | -4.3 °C | 87.63 mm |
| February | -15 °C | -2.6 °C | 78.99 mm |
| March | -9.3 °C | 2.6 °C | 85.34 mm |
| April | -0.9 °C | 10.4 °C | 102.87 mm |
| May | 5.5 °C | 18.1 °C | 113.28 mm |
| June | 10.2 °C | 22.8 °C | 126.24 mm |
| July | 12.8 °C | 25.3 °C | 119.63 mm |
| August | 11.7 °C | 24.4 °C | 114.55 mm |
| September | 8.1 °C | 20.4 °C | 96.52 mm |
| October | 1.6 °C | 13 °C | 135.13 mm |
| November | -4.1 °C | 5.7 °C | 112.27 mm |
| December | -10.2 °C | -0.8 °C | 107.44 mm |
| Annual | -0.4 °C | 11.3 °C | 1279.89 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |