Gladstone, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.8 °C (low) to 11.5 °C (high). Annual precipitation averages 816.4 Millimeters. Gladstone is located in USDA Plant Hardiness Zone 5a. 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 | -12.6 °C | -3.8 °C | 41.4 mm |
| February | -12.7 °C | -2.3 °C | 31.5 mm |
| March | -8.1 °C | 3.6 °C | 45.97 mm |
| April | -1.7 °C | 10.1 °C | 66.29 mm |
| May | 4.7 °C | 17.6 °C | 75.44 mm |
| June | 10.4 °C | 23 °C | 86.87 mm |
| July | 13.3 °C | 25.7 °C | 94.23 mm |
| August | 13.3 °C | 24.9 °C | 82.3 mm |
| September | 9.4 °C | 20.5 °C | 91.95 mm |
| October | 3.3 °C | 13.1 °C | 82.8 mm |
| November | -2.3 °C | 5.7 °C | 63.5 mm |
| December | -8 °C | -0.4 °C | 54.1 mm |
| Annual | 0.8 °C | 11.5 °C | 816.35 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |