Millersburg, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 54.2 °F (high). Annual precipitation averages 32 Inches. Millersburg 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 | 11.2 °F | 26.6 °F | 1.99 in. |
| February | 9.9 °F | 29.2 °F | 1.45 in. |
| March | 17.3 °F | 39.0 °F | 1.75 in. |
| April | 29.5 °F | 51.7 °F | 2.88 in. |
| May | 41.0 °F | 65.9 °F | 3.03 in. |
| June | 50.6 °F | 75.5 °F | 2.99 in. |
| July | 55.5 °F | 79.7 °F | 3.13 in. |
| August | 54.1 °F | 78.5 °F | 3.31 in. |
| September | 47.0 °F | 71.2 °F | 3.16 in. |
| October | 37.0 °F | 57.1 °F | 3.58 in. |
| November | 28.2 °F | 43.3 °F | 2.49 in. |
| December | 19.1 °F | 32.4 °F | 2.21 in. |
| Annual | 33.4 °F | 54.2 °F | 31.97 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 |