Norwich, Ontario climate data is summarized below. Average annual temperatures range from 3.6 °C (low) to 13.4 °C (high). Annual precipitation averages 481 Millimeters. Norwich is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.66 °C | -1.44 °C | 8 mm |
| February | -10.11 °C | -1.85 °C | 1 mm |
| March | -3.96 °C | 5.43 °C | 28 mm |
| April | 2 °C | 13.03 °C | 34 mm |
| May | 8.28 °C | 20.05 °C | 51 mm |
| June | 13.5 °C | 24.84 °C | 69 mm |
| July | 15.54 °C | 27.16 °C | 84 mm |
| August | 14.86 °C | 26.32 °C | 82 mm |
| September | 10.68 °C | 22.15 °C | 63 mm |
| October | 5.53 °C | 15.2 °C | 31 mm |
| November | -0.15 °C | 8.03 °C | 20 mm |
| December | -4.51 °C | 1.63 °C | 10 mm |
| Annual | 3.6 °C | 13.4 °C | 481 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |