Sandusky, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.3 °F (low) to 56 °F (high). Annual precipitation averages 31.5 Inches. Sandusky is located in USDA Plant Hardiness Zone 6a. 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 | 15.2 °F | 29.0 °F | 2.08 in. |
| February | 15.0 °F | 31.5 °F | 1.52 in. |
| March | 23.4 °F | 41.1 °F | 1.81 in. |
| April | 33.7 °F | 54.2 °F | 2.93 in. |
| May | 45.1 °F | 66.7 °F | 3.37 in. |
| June | 54.8 °F | 76.8 °F | 3.25 in. |
| July | 59.3 °F | 80.8 °F | 3.08 in. |
| August | 57.7 °F | 78.9 °F | 2.99 in. |
| September | 50.4 °F | 72.9 °F | 3.25 in. |
| October | 40.5 °F | 59.6 °F | 2.89 in. |
| November | 30.7 °F | 46.1 °F | 2.36 in. |
| December | 22.1 °F | 34.6 °F | 1.92 in. |
| Annual | 37.3 °F | 56 °F | 31.45 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 6a : -10°F to -5°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 |