Harbor Springs, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.8 °F (low) to 52.5 °F (high). Annual precipitation averages 34.3 Inches. Harbor Springs is located in USDA Plant Hardiness Zone 5b. 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 | 14.0 °F | 27.0 °F | 2.43 in. |
| February | 12.5 °F | 28.4 °F | 1.56 in. |
| March | 19.3 °F | 37.6 °F | 1.84 in. |
| April | 30.9 °F | 49.3 °F | 2.87 in. |
| May | 42.2 °F | 62.9 °F | 2.98 in. |
| June | 52.4 °F | 71.3 °F | 2.9 in. |
| July | 58.1 °F | 76.0 °F | 2.66 in. |
| August | 57.5 °F | 75.7 °F | 3.22 in. |
| September | 50.7 °F | 69.3 °F | 3.65 in. |
| October | 39.8 °F | 56.0 °F | 4.35 in. |
| November | 30.6 °F | 43.3 °F | 3.12 in. |
| December | 22.0 °F | 33.1 °F | 2.71 in. |
| Annual | 35.8 °F | 52.5 °F | 34.29 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |