Marlette, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.9 °F (low) to 56.4 °F (high). Annual precipitation averages 31.2 Inches. Marlette 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.0 °F | 29.4 °F | 2.13 in. |
| February | 14.9 °F | 32.0 °F | 1.68 in. |
| March | 22.9 °F | 41.5 °F | 1.73 in. |
| April | 33.2 °F | 55.1 °F | 3.15 in. |
| May | 44.5 °F | 67.2 °F | 3.24 in. |
| June | 54.2 °F | 77.3 °F | 3.08 in. |
| July | 58.4 °F | 81.1 °F | 3.43 in. |
| August | 57.5 °F | 79.0 °F | 2.78 in. |
| September | 50.1 °F | 73.1 °F | 2.93 in. |
| October | 40.2 °F | 60.0 °F | 2.72 in. |
| November | 29.9 °F | 46.3 °F | 2.47 in. |
| December | 21.4 °F | 34.6 °F | 1.9 in. |
| Annual | 36.9 °F | 56.4 °F | 31.24 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |