Falmouth, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 54.2 °F (high). Annual precipitation averages 33.7 Inches. Falmouth 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 | 10.8 °F | 26.7 °F | 2.01 in. |
| February | 10.3 °F | 29.7 °F | 1.59 in. |
| March | 18.2 °F | 40.0 °F | 1.94 in. |
| April | 30.1 °F | 52.6 °F | 3.43 in. |
| May | 41.9 °F | 66.0 °F | 3.56 in. |
| June | 51.5 °F | 75.8 °F | 3.44 in. |
| July | 55.1 °F | 80.0 °F | 3.1 in. |
| August | 53.3 °F | 78.1 °F | 3.24 in. |
| September | 45.4 °F | 70.5 °F | 3.04 in. |
| October | 35.9 °F | 56.4 °F | 3.64 in. |
| November | 27.0 °F | 42.9 °F | 2.61 in. |
| December | 18.2 °F | 31.9 °F | 2.1 in. |
| Annual | 33.1 °F | 54.2 °F | 33.7 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 |