Horton Bay, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 11.9 °C (high). Annual precipitation averages 869.4 Millimeters. Horton Bay is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10 °C | -2.7 °C | 59.69 mm |
| February | -10.9 °C | -1.7 °C | 38.86 mm |
| March | -7.2 °C | 3.6 °C | 45.72 mm |
| April | -0.7 °C | 10.5 °C | 71.88 mm |
| May | 5.6 °C | 18.2 °C | 76.2 mm |
| June | 11.2 °C | 23.1 °C | 75.44 mm |
| July | 13.8 °C | 25.4 °C | 69.34 mm |
| August | 13.4 °C | 25.1 °C | 82.55 mm |
| September | 9.4 °C | 21.2 °C | 93.22 mm |
| October | 3.8 °C | 13.6 °C | 109.73 mm |
| November | -1.1 °C | 6.4 °C | 77.98 mm |
| December | -5.8 °C | 0.5 °C | 68.83 mm |
| Annual | 1.8 °C | 11.9 °C | 869.44 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |