Harbor Beach, 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 °C (high). Annual precipitation averages 856.5 Millimeters. Harbor Beach 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 | -8.4 °C | -1.6 °C | 59.18 mm |
| February | -8.5 °C | -0.7 °C | 50.29 mm |
| March | -4.1 °C | 3.8 °C | 49.28 mm |
| April | 1.4 °C | 9.6 °C | 81.79 mm |
| May | 7.3 °C | 16.2 °C | 85.09 mm |
| June | 12.9 °C | 21.8 °C | 85.34 mm |
| July | 16.2 °C | 24.9 °C | 75.44 mm |
| August | 15.7 °C | 24.6 °C | 86.87 mm |
| September | 11.8 °C | 21.2 °C | 83.31 mm |
| October | 6.2 °C | 14.4 °C | 75.44 mm |
| November | 0.6 °C | 7.7 °C | 66.04 mm |
| December | -4.3 °C | 1.7 °C | 58.42 mm |
| Annual | 3.9 °C | 12 °C | 856.49 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 |