Lexington, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.1 °C (low) to 12.9 °C (high). Annual precipitation averages 860 Millimeters. Lexington is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | -1.1 °C | 58.17 mm |
| February | -8.2 °C | 0.2 °C | 49.53 mm |
| March | -3.8 °C | 4.8 °C | 53.34 mm |
| April | 1.4 °C | 10.9 °C | 82.04 mm |
| May | 7.4 °C | 17.5 °C | 86.36 mm |
| June | 13.1 °C | 23.2 °C | 80.52 mm |
| July | 16.4 °C | 26 °C | 75.69 mm |
| August | 15.9 °C | 25.6 °C | 85.34 mm |
| September | 12.3 °C | 22.3 °C | 81.28 mm |
| October | 6.3 °C | 15.4 °C | 81.03 mm |
| November | 0.6 °C | 8.4 °C | 66.29 mm |
| December | -4.6 °C | 2.1 °C | 60.45 mm |
| Annual | 4.1 °C | 12.9 °C | 860.04 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |