Norwich, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.5 °F (low) to 57.8 °F (high). Annual precipitation averages 43.8 Inches. Norwich is located in USDA Plant Hardiness Zone 5b. 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 | 12.9 °F | 32.0 °F | 3.07 in. |
| February | 13.7 °F | 34.8 °F | 2.63 in. |
| March | 20.8 °F | 42.9 °F | 3.34 in. |
| April | 32.5 °F | 56.8 °F | 3.62 in. |
| May | 43.5 °F | 69.5 °F | 3.71 in. |
| June | 52.6 °F | 77.5 °F | 4.85 in. |
| July | 57.1 °F | 81.5 °F | 4.13 in. |
| August | 55.8 °F | 80.0 °F | 4.37 in. |
| September | 48.7 °F | 73.2 °F | 3.97 in. |
| October | 38.4 °F | 60.6 °F | 3.68 in. |
| November | 28.9 °F | 47.9 °F | 3.06 in. |
| December | 21.0 °F | 36.8 °F | 3.32 in. |
| Annual | 35.5 °F | 57.8 °F | 43.75 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |