Port Austin, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.9 °C (low) to 12.3 °C (high). Annual precipitation averages 788.9 Millimeters. Port Austin is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | -1.4 °C | 45.97 mm |
| February | -8.7 °C | -0.8 °C | 38.35 mm |
| March | -4.3 °C | 3.5 °C | 41.91 mm |
| April | 1.4 °C | 10.2 °C | 82.8 mm |
| May | 7.5 °C | 17.1 °C | 78.49 mm |
| June | 13.3 °C | 22.5 °C | 81.28 mm |
| July | 16.3 °C | 25.6 °C | 74.93 mm |
| August | 15.6 °C | 25.1 °C | 78.49 mm |
| September | 11.8 °C | 21.6 °C | 80.26 mm |
| October | 6.2 °C | 14.8 °C | 79.25 mm |
| November | 0.5 °C | 7.7 °C | 57.66 mm |
| December | -4.4 °C | 1.8 °C | 49.53 mm |
| Annual | 3.9 °C | 12.3 °C | 788.92 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |