Fulton, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 9.5 °C (high). Annual precipitation averages 819.2 Millimeters. Fulton 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 | -12.8 °C | -5.4 °C | 67.06 mm |
| February | -11.8 °C | -3.9 °C | 40.89 mm |
| March | -8.8 °C | 1.5 °C | 42.42 mm |
| April | -1.8 °C | 7.4 °C | 58.17 mm |
| May | 4.6 °C | 15.4 °C | 74.42 mm |
| June | 9.8 °C | 21.2 °C | 74.93 mm |
| July | 13.2 °C | 23.8 °C | 78.74 mm |
| August | 12.8 °C | 23.2 °C | 69.85 mm |
| September | 9.1 °C | 19 °C | 85.6 mm |
| October | 2.9 °C | 11.2 °C | 87.88 mm |
| November | -3 °C | 3.4 °C | 68.07 mm |
| December | -8.2 °C | -2.3 °C | 71.12 mm |
| Annual | 0.5 °C | 9.5 °C | 819.15 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 |