Brutus, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 53.5 °F (high). Annual precipitation averages 33.2 Inches. Brutus is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.6 °F | 26.4 °F | 2.38 in. |
| February | 8.9 °F | 28.6 °F | 1.52 in. |
| March | 16.3 °F | 38.2 °F | 1.8 in. |
| April | 29.0 °F | 50.9 °F | 2.85 in. |
| May | 40.6 °F | 65.1 °F | 2.86 in. |
| June | 50.4 °F | 74.9 °F | 2.76 in. |
| July | 55.3 °F | 78.7 °F | 2.78 in. |
| August | 54.0 °F | 77.5 °F | 3.01 in. |
| September | 46.8 °F | 70.2 °F | 3.44 in. |
| October | 37.0 °F | 56.3 °F | 4.22 in. |
| November | 28.3 °F | 43.1 °F | 2.99 in. |
| December | 19.3 °F | 32.4 °F | 2.6 in. |
| Annual | 33 °F | 53.5 °F | 33.21 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |