Lewis, Manitoba climate data is summarized below. Average annual temperatures range from -2.2 °C (low) to 8.5 °C (high). Annual precipitation averages 555 Millimeters. Lewis is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.07 °C | -11.07 °C | 0 mm |
| February | -20.31 °C | -8.94 °C | 0 mm |
| March | -11.18 °C | 0.49 °C | 3 mm |
| April | -2.31 °C | 9.59 °C | 36 mm |
| May | 4.67 °C | 17.27 °C | 91 mm |
| June | 11.09 °C | 22.64 °C | 126 mm |
| July | 13.61 °C | 25.57 °C | 100 mm |
| August | 12.68 °C | 24.61 °C | 84 mm |
| September | 7.86 °C | 19.42 °C | 63 mm |
| October | 1.93 °C | 10.97 °C | 52 mm |
| November | -6.53 °C | 1 °C | 0 mm |
| December | -17.36 °C | -9.13 °C | 0 mm |
| Annual | -2.2 °C | 8.5 °C | 555 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |