Lake Ann, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.2 °F (low) to 54.9 °F (high). Annual precipitation averages 34.6 Inches. Lake Ann is located in USDA Plant Hardiness Zone 6a. 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 | 14.7 °F | 27.8 °F | 2.34 in. |
| February | 14.5 °F | 30.3 °F | 1.72 in. |
| March | 21.3 °F | 40.2 °F | 1.95 in. |
| April | 31.8 °F | 52.9 °F | 3.06 in. |
| May | 42.9 °F | 66.3 °F | 3.16 in. |
| June | 53.0 °F | 76.2 °F | 3.05 in. |
| July | 57.7 °F | 80.3 °F | 2.7 in. |
| August | 56.8 °F | 78.7 °F | 3.1 in. |
| September | 49.9 °F | 71.3 °F | 3.63 in. |
| October | 39.5 °F | 57.9 °F | 4.21 in. |
| November | 30.1 °F | 44.0 °F | 2.98 in. |
| December | 21.7 °F | 33.3 °F | 2.67 in. |
| Annual | 36.2 °F | 54.9 °F | 34.57 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |