Marcellus, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40 °F (low) to 58 °F (high). Annual precipitation averages 39.6 Inches. Marcellus 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 | 17.4 °F | 30.9 °F | 2.82 in. |
| February | 18.9 °F | 33.9 °F | 2.12 in. |
| March | 26.6 °F | 44.7 °F | 2.36 in. |
| April | 37.7 °F | 57.6 °F | 3.51 in. |
| May | 49.3 °F | 69.1 °F | 4.23 in. |
| June | 58.5 °F | 78.3 °F | 4.05 in. |
| July | 62.0 °F | 82.2 °F | 3.8 in. |
| August | 60.3 °F | 80.4 °F | 4.11 in. |
| September | 52.7 °F | 74.3 °F | 3.43 in. |
| October | 41.5 °F | 61.0 °F | 3.75 in. |
| November | 32.1 °F | 47.4 °F | 2.92 in. |
| December | 23.4 °F | 35.8 °F | 2.45 in. |
| Annual | 40 °F | 58 °F | 39.55 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |