Hemlock, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 14.2 °C (high). Annual precipitation averages 850.9 Millimeters. Hemlock 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | -1.2 °C | 54.1 mm |
| February | -9.4 °C | 0.2 °C | 44.96 mm |
| March | -4.8 °C | 5.9 °C | 49.78 mm |
| April | 1.4 °C | 13.5 °C | 87.38 mm |
| May | 8 °C | 20.6 °C | 91.95 mm |
| June | 13.5 °C | 25.9 °C | 89.66 mm |
| July | 15.3 °C | 28.2 °C | 78.49 mm |
| August | 14.1 °C | 27.1 °C | 89.66 mm |
| September | 9.8 °C | 23.5 °C | 70.1 mm |
| October | 4.1 °C | 16.2 °C | 80.01 mm |
| November | -1 °C | 8.2 °C | 63.5 mm |
| December | -5.7 °C | 1.8 °C | 51.31 mm |
| Annual | 3 °C | 14.2 °C | 850.9 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |