Leamington, Ontario climate data is summarized below. Average annual temperatures range from 43.6 °F (low) to 56.1 °F (high). Annual precipitation averages 23.7 Inches. Leamington is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.6 °F | -18.3 °F | 482.6 in. |
| February | -21.9 °F | -18.4 °F | 406.4 in. |
| March | -18.7 °F | -14.7 °F | 1244.6 in. |
| April | -15.5 °F | -11 °F | 1600.2 in. |
| May | -11.8 °F | -7.2 °F | 1752.6 in. |
| June | -8.5 °F | -4.3 °F | 1803.4 in. |
| July | -7.1 °F | -3 °F | 1803.4 in. |
| August | -7.3 °F | -3.4 °F | 1524 in. |
| September | -9.7 °F | -5.5 °F | 1549.4 in. |
| October | -12.8 °F | -9 °F | 1143 in. |
| November | -16.3 °F | -13 °F | 1092.2 in. |
| December | -19.1 °F | -16.3 °F | 863.6 in. |
| Annual | 43.6 °F | 56.1 °F | 23.67 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Normal |