Shelby, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.8 °F (low) to 55.1 °F (high). Annual precipitation averages 37.5 Inches. Shelby is located in USDA Plant Hardiness Zone 6a. 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 | 15.9 °F | 28.9 °F | 2.7 in. |
| February | 16.4 °F | 31.7 °F | 2.14 in. |
| March | 22.4 °F | 41.6 °F | 2.2 in. |
| April | 33.1 °F | 53.5 °F | 3.58 in. |
| May | 44.6 °F | 65.7 °F | 3.75 in. |
| June | 54.1 °F | 75.2 °F | 3.44 in. |
| July | 57.8 °F | 78.8 °F | 3.31 in. |
| August | 56.8 °F | 77.5 °F | 3.46 in. |
| September | 49.3 °F | 71.1 °F | 3.21 in. |
| October | 39.1 °F | 57.8 °F | 4.03 in. |
| November | 30.4 °F | 45.0 °F | 3.11 in. |
| December | 22.1 °F | 33.8 °F | 2.55 in. |
| Annual | 36.8 °F | 55.1 °F | 37.48 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |