Amherstburg, Ontario climate data is summarized below. Average annual temperatures range from 44 °F (low) to 56.7 °F (high). Annual precipitation averages 19.7 Inches. Amherstburg is located in USDA Plant Hardiness Zone 7a. 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 | -21.4 °F | -18 °F | 457.2 in. |
| February | -21.8 °F | -18.1 °F | 228.6 in. |
| March | -18.5 °F | -14.1 °F | 889 in. |
| April | -15.3 °F | -10.6 °F | 1219.2 in. |
| May | -11.8 °F | -7.1 °F | 1422.4 in. |
| June | -8.5 °F | -4.3 °F | 1727.2 in. |
| July | -7.1 °F | -3 °F | 1574.8 in. |
| August | -7.2 °F | -3.3 °F | 1422.4 in. |
| September | -9.5 °F | -5.5 °F | 1371.6 in. |
| October | -12.7 °F | -9 °F | 838.2 in. |
| November | -16.3 °F | -12.8 °F | 914.4 in. |
| December | -19 °F | -16.2 °F | 660.4 in. |
| Annual | 44 °F | 56.7 °F | 19.72 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Normal |