Port Austin, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39 °F (low) to 54.1 °F (high). Annual precipitation averages 31.1 Inches. 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 | 16.6 °F | 29.4 °F | 1.81 in. |
| February | 16.4 °F | 30.6 °F | 1.51 in. |
| March | 24.2 °F | 38.3 °F | 1.65 in. |
| April | 34.5 °F | 50.4 °F | 3.26 in. |
| May | 45.5 °F | 62.7 °F | 3.09 in. |
| June | 56.0 °F | 72.5 °F | 3.2 in. |
| July | 61.3 °F | 78.0 °F | 2.95 in. |
| August | 60.1 °F | 77.2 °F | 3.09 in. |
| September | 53.3 °F | 70.8 °F | 3.16 in. |
| October | 43.2 °F | 58.7 °F | 3.12 in. |
| November | 32.9 °F | 45.9 °F | 2.27 in. |
| December | 24.1 °F | 35.2 °F | 1.95 in. |
| Annual | 39 °F | 54.1 °F | 31.06 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |