Stephenson, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 12.2 °C (high). Annual precipitation averages 803.6 Millimeters. Stephenson is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.9 °C | -3.6 °C | 34.29 mm |
| February | -13.4 °C | -1.5 °C | 25.65 mm |
| March | -7.6 °C | 4.4 °C | 45.21 mm |
| April | -1 °C | 11.1 °C | 74.42 mm |
| May | 5.3 °C | 18.6 °C | 82.55 mm |
| June | 10.9 °C | 24.1 °C | 96.77 mm |
| July | 13.4 °C | 26.7 °C | 94.23 mm |
| August | 12.7 °C | 25.6 °C | 78.99 mm |
| September | 8.5 °C | 21.4 °C | 90.42 mm |
| October | 2.3 °C | 13.8 °C | 80.26 mm |
| November | -3.4 °C | 5.9 °C | 54.86 mm |
| December | -9.8 °C | -0.7 °C | 45.97 mm |
| Annual | 0.3 °C | 12.2 °C | 803.62 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |