Brutus, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 12 °C (high). Annual precipitation averages 843.5 Millimeters. 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 | -11.9 °C | -3.1 °C | 60.45 mm |
| February | -12.8 °C | -1.9 °C | 38.61 mm |
| March | -8.7 °C | 3.4 °C | 45.72 mm |
| April | -1.7 °C | 10.5 °C | 72.39 mm |
| May | 4.8 °C | 18.4 °C | 72.64 mm |
| June | 10.2 °C | 23.8 °C | 70.1 mm |
| July | 12.9 °C | 25.9 °C | 70.61 mm |
| August | 12.2 °C | 25.3 °C | 76.45 mm |
| September | 8.2 °C | 21.2 °C | 87.38 mm |
| October | 2.8 °C | 13.5 °C | 107.19 mm |
| November | -2.1 °C | 6.2 °C | 75.95 mm |
| December | -7.1 °C | 0.2 °C | 66.04 mm |
| Annual | 0.6 °C | 12 °C | 843.53 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |