Lewiston, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.8 °C (low) to 11.8 °C (high). Annual precipitation averages 820.4 Millimeters. Lewiston is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.7 °C | -3.7 °C | 50.04 mm |
| February | -12.2 °C | -2.2 °C | 37.59 mm |
| March | -8.1 °C | 3.6 °C | 44.96 mm |
| April | -1.3 °C | 10.7 °C | 78.99 mm |
| May | 5.4 °C | 18.7 °C | 77.47 mm |
| June | 10.7 °C | 23.9 °C | 84.33 mm |
| July | 13.2 °C | 25.9 °C | 78.99 mm |
| August | 12.4 °C | 25.2 °C | 83.57 mm |
| September | 8.3 °C | 21.1 °C | 81.03 mm |
| October | 2.5 °C | 13.2 °C | 86.61 mm |
| November | -2.4 °C | 5.6 °C | 60.96 mm |
| December | -7.6 °C | -0.6 °C | 55.88 mm |
| Annual | 0.8 °C | 11.8 °C | 820.42 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |