Port Dover, Ontario climate data is summarized below. Average annual temperatures range from 40.6 °F (low) to 55.7 °F (high). Annual precipitation averages 20.5 Inches. Port Dover is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.9 °F | -18.1 °F | 406.4 in. |
| February | -22.8 °F | -18.5 °F | 304.8 in. |
| March | -19.4 °F | -14.8 °F | 939.8 in. |
| April | -16.4 °F | -11.3 °F | 1244.6 in. |
| May | -13 °F | -7.5 °F | 1549.4 in. |
| June | -9.9 °F | -4.7 °F | 1498.6 in. |
| July | -8.5 °F | -3.2 °F | 1828.8 in. |
| August | -8.7 °F | -3.5 °F | 1651 in. |
| September | -10.8 °F | -5.7 °F | 1270 in. |
| October | -13.7 °F | -9.2 °F | 1092.2 in. |
| November | -16.8 °F | -12.8 °F | 812.8 in. |
| December | -19.4 °F | -16.1 °F | 660.4 in. |
| Annual | 40.6 °F | 55.7 °F | 20.54 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |