Leamington, Ontario climate data is summarized below. Average annual temperatures range from 6.5 °C (low) to 13.4 °C (high). Annual precipitation averages 601 Millimeters. 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 | -6.82 °C | -0.91 °C | 19 mm |
| February | -7.5 °C | -1.06 °C | 16 mm |
| March | -1.7 °C | 5.46 °C | 49 mm |
| April | 4.09 °C | 12.13 °C | 63 mm |
| May | 10.7 °C | 19.04 °C | 69 mm |
| June | 16.68 °C | 24.18 °C | 71 mm |
| July | 19.28 °C | 26.67 °C | 71 mm |
| August | 18.84 °C | 25.93 °C | 60 mm |
| September | 14.58 °C | 22.06 °C | 61 mm |
| October | 9 °C | 15.76 °C | 45 mm |
| November | 2.64 °C | 8.66 °C | 43 mm |
| December | -2.42 °C | 2.58 °C | 34 mm |
| Annual | 6.5 °C | 13.4 °C | 601 mm |
| 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 : -17.8°C to -15°C |
| Current Drought Conditions | Normal |