Lewiston, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 53.2 °F (high). Annual precipitation averages 32.3 Inches. 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 | 10.9 °F | 25.4 °F | 1.97 in. |
| February | 10.0 °F | 28.1 °F | 1.48 in. |
| March | 17.5 °F | 38.4 °F | 1.77 in. |
| April | 29.7 °F | 51.2 °F | 3.11 in. |
| May | 41.8 °F | 65.6 °F | 3.05 in. |
| June | 51.2 °F | 75.0 °F | 3.32 in. |
| July | 55.8 °F | 78.6 °F | 3.11 in. |
| August | 54.3 °F | 77.3 °F | 3.29 in. |
| September | 47.0 °F | 70.0 °F | 3.19 in. |
| October | 36.5 °F | 55.7 °F | 3.41 in. |
| November | 27.6 °F | 42.1 °F | 2.4 in. |
| December | 18.3 °F | 30.9 °F | 2.2 in. |
| Annual | 33.4 °F | 53.2 °F | 32.3 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |