Lewis, Manitoba climate data is summarized below. Average annual temperatures range from 28 °F (low) to 47.4 °F (high). Annual precipitation averages 21.9 Inches. 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 | -29.5 °F | -23.9 °F | 0 in. |
| February | -29.1 °F | -22.7 °F | 0 in. |
| March | -24 °F | -17.5 °F | 76.2 in. |
| April | -19.1 °F | -12.5 °F | 914.4 in. |
| May | -15.2 °F | -8.2 °F | 2311.4 in. |
| June | -11.6 °F | -5.2 °F | 3200.4 in. |
| July | -10.2 °F | -3.6 °F | 2540 in. |
| August | -10.7 °F | -4.1 °F | 2133.6 in. |
| September | -13.4 °F | -7 °F | 1600.2 in. |
| October | -16.7 °F | -11.7 °F | 1320.8 in. |
| November | -21.4 °F | -17.2 °F | 0 in. |
| December | -27.4 °F | -22.9 °F | 0 in. |
| Annual | 28 °F | 47.4 °F | 21.86 in. |
| 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°F to -35°F |
| Current Drought Conditions | Normal |