Hardwick, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.2 °C (low) to 11.7 °C (high). Annual precipitation averages 1101.3 Millimeters. Hardwick 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15 °C | -3.7 °C | 67.56 mm |
| February | -14.3 °C | -1.8 °C | 59.18 mm |
| March | -8.7 °C | 3.2 °C | 70.61 mm |
| April | -1.3 °C | 11 °C | 87.12 mm |
| May | 5.4 °C | 18.6 °C | 99.31 mm |
| June | 10.3 °C | 23.2 °C | 117.6 mm |
| July | 13.1 °C | 25.7 °C | 118.36 mm |
| August | 11.9 °C | 24.9 °C | 106.93 mm |
| September | 8 °C | 20.8 °C | 93.73 mm |
| October | 1.9 °C | 13.2 °C | 114.05 mm |
| November | -3.6 °C | 5.9 °C | 81.53 mm |
| December | -9.8 °C | -0.4 °C | 85.34 mm |
| Annual | -0.2 °C | 11.7 °C | 1101.32 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |