New Hamburg, Ontario climate data is summarized below. Average annual temperatures range from 36.5 °F (low) to 53.5 °F (high). Annual precipitation averages 19.1 Inches. New Hamburg 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -23.2 °F | -19.4 °F | 0 in. |
| February | -24.1 °F | -19.5 °F | 0 in. |
| March | -20.8 °F | -15.6 °F | 609.6 in. |
| April | -17.3 °F | -11.3 °F | 914.4 in. |
| May | -13.7 °F | -7.3 °F | 1371.6 in. |
| June | -10.9 °F | -4.7 °F | 1905 in. |
| July | -9.9 °F | -3.5 °F | 2514.6 in. |
| August | -10.2 °F | -4.1 °F | 2159 in. |
| September | -12.4 °F | -6.4 °F | 1422.4 in. |
| October | -15.1 °F | -10.2 °F | 762 in. |
| November | -18.2 °F | -14.1 °F | 457.2 in. |
| December | -20.9 °F | -17.6 °F | 228.6 in. |
| Annual | 36.5 °F | 53.5 °F | 19.13 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |