Rosebush, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.7 °F (low) to 56.6 °F (high). Annual precipitation averages 33.8 Inches. Rosebush is located in USDA Plant Hardiness Zone 6a. 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 | 14.5 °F | 29.2 °F | 2.1 in. |
| February | 14.7 °F | 31.7 °F | 1.71 in. |
| March | 22.5 °F | 42.1 °F | 2.07 in. |
| April | 33.7 °F | 55.7 °F | 3.53 in. |
| May | 45.5 °F | 68.2 °F | 3.67 in. |
| June | 55.3 °F | 77.7 °F | 3.53 in. |
| July | 58.9 °F | 82.0 °F | 2.98 in. |
| August | 57.1 °F | 80.0 °F | 3.48 in. |
| September | 49.0 °F | 73.1 °F | 2.8 in. |
| October | 38.6 °F | 59.5 °F | 3.38 in. |
| November | 29.6 °F | 45.9 °F | 2.59 in. |
| December | 21.4 °F | 34.5 °F | 1.99 in. |
| Annual | 36.7 °F | 56.6 °F | 33.83 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |