Brimley, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.1 °F (low) to 50.2 °F (high). Annual precipitation averages 35.1 Inches. Brimley is located in USDA Plant Hardiness Zone 4b. 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 | 6.6 °F | 23.0 °F | 2.34 in. |
| February | 6.5 °F | 24.8 °F | 1.67 in. |
| March | 14.4 °F | 34.1 °F | 1.81 in. |
| April | 28.5 °F | 46.7 °F | 2.75 in. |
| May | 40.1 °F | 61.5 °F | 2.69 in. |
| June | 49.0 °F | 70.8 °F | 3.03 in. |
| July | 55.1 °F | 75.6 °F | 3.07 in. |
| August | 54.9 °F | 74.7 °F | 3.18 in. |
| September | 48.3 °F | 67.2 °F | 3.88 in. |
| October | 37.8 °F | 53.2 °F | 4.42 in. |
| November | 27.9 °F | 40.8 °F | 3.4 in. |
| December | 16.4 °F | 29.9 °F | 2.89 in. |
| Annual | 32.1 °F | 50.2 °F | 35.13 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |