Brown City, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37 °F (low) to 56.7 °F (high). Annual precipitation averages 32.3 Inches. Brown City 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.1 °F | 29.6 °F | 2.13 in. |
| February | 14.9 °F | 32.3 °F | 1.72 in. |
| March | 23.3 °F | 42.0 °F | 1.9 in. |
| April | 33.7 °F | 55.3 °F | 3.13 in. |
| May | 44.8 °F | 67.5 °F | 3.44 in. |
| June | 54.5 °F | 77.8 °F | 3.25 in. |
| July | 58.7 °F | 81.7 °F | 3.39 in. |
| August | 57.4 °F | 79.3 °F | 3.02 in. |
| September | 50.0 °F | 73.5 °F | 2.98 in. |
| October | 40.1 °F | 60.2 °F | 2.83 in. |
| November | 30.1 °F | 46.6 °F | 2.48 in. |
| December | 21.7 °F | 34.9 °F | 2.01 in. |
| Annual | 37 °F | 56.7 °F | 32.28 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |