Rothbury, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.6 °F (low) to 55.6 °F (high). Annual precipitation averages 37.1 Inches. Rothbury 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 | 17.0 °F | 29.5 °F | 2.61 in. |
| February | 17.2 °F | 31.9 °F | 2.02 in. |
| March | 23.6 °F | 41.4 °F | 2.21 in. |
| April | 34.1 °F | 54.3 °F | 3.61 in. |
| May | 44.7 °F | 66.3 °F | 3.74 in. |
| June | 54.3 °F | 75.7 °F | 3.46 in. |
| July | 58.7 °F | 79.4 °F | 3.26 in. |
| August | 57.6 °F | 78.1 °F | 3.38 in. |
| September | 50.3 °F | 71.5 °F | 3.2 in. |
| October | 39.9 °F | 58.7 °F | 3.99 in. |
| November | 31.1 °F | 45.3 °F | 3.07 in. |
| December | 23.1 °F | 34.5 °F | 2.51 in. |
| Annual | 37.6 °F | 55.6 °F | 37.06 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 |