Hanover, Ontario climate data is summarized below. Average annual temperatures range from 36.4 °F (low) to 53.6 °F (high). Annual precipitation averages 21.3 Inches. Hanover is located in USDA Plant Hardiness Zone 5b. 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 | -23.3 °F | -19.4 °F | 0 in. |
| February | -24.1 °F | -19.6 °F | 0 in. |
| March | -21 °F | -15.8 °F | 685.8 in. |
| April | -17.3 °F | -11.3 °F | 1168.4 in. |
| May | -13.9 °F | -7.3 °F | 1828.8 in. |
| June | -11.2 °F | -4.8 °F | 1981.2 in. |
| July | -9.9 °F | -3.5 °F | 1727.2 in. |
| August | -10.1 °F | -3.9 °F | 2006.6 in. |
| September | -12.3 °F | -6.3 °F | 1752.6 in. |
| October | -14.9 °F | -10.1 °F | 1727.2 in. |
| November | -18 °F | -13.9 °F | 863.6 in. |
| December | -21 °F | -17.7 °F | 0 in. |
| Annual | 36.4 °F | 53.6 °F | 21.3 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |