Eastport, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 11.9 °C (high). Annual precipitation averages 839.2 Millimeters. Eastport is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | -2.5 °C | 53.34 mm |
| February | -9 °C | -1.6 °C | 36.32 mm |
| March | -5.7 °C | 3.5 °C | 44.2 mm |
| April | 0.4 °C | 10.3 °C | 71.12 mm |
| May | 6.6 °C | 17.7 °C | 76.96 mm |
| June | 12 °C | 22.8 °C | 79.25 mm |
| July | 15.1 °C | 25.4 °C | 69.09 mm |
| August | 14.7 °C | 24.9 °C | 79.5 mm |
| September | 11.1 °C | 21.2 °C | 92.71 mm |
| October | 5.2 °C | 13.5 °C | 104.65 mm |
| November | 0.3 °C | 6.8 °C | 70.87 mm |
| December | -4.7 °C | 0.7 °C | 61.21 mm |
| Annual | 3.1 °C | 11.9 °C | 839.22 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |