Norwich, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.8 °F (low) to 56.2 °F (high). Annual precipitation averages 40.2 Inches. Norwich 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.2 °F | 28.7 °F | 2.73 in. |
| February | 9.6 °F | 32.2 °F | 2.39 in. |
| March | 18.8 °F | 40.9 °F | 3.04 in. |
| April | 31.1 °F | 55.3 °F | 3.21 in. |
| May | 43.0 °F | 68.3 °F | 3.31 in. |
| June | 52.1 °F | 76.5 °F | 3.78 in. |
| July | 57.6 °F | 81.5 °F | 4.3 in. |
| August | 55.7 °F | 79.9 °F | 3.44 in. |
| September | 48.2 °F | 72.5 °F | 3.47 in. |
| October | 36.7 °F | 58.6 °F | 4.15 in. |
| November | 27.2 °F | 45.8 °F | 3.03 in. |
| December | 17.0 °F | 34.1 °F | 3.37 in. |
| Annual | 33.8 °F | 56.2 °F | 40.22 in. |
| 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |