Mass City, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.4 °F (low) to 50.9 °F (high). Annual precipitation averages 34.3 Inches. Mass City is located in USDA Plant Hardiness Zone 4b. 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 | 6.2 °F | 22.1 °F | 2.58 in. |
| February | 5.6 °F | 25.9 °F | 1.7 in. |
| March | 13.8 °F | 36.8 °F | 1.77 in. |
| April | 26.8 °F | 49.0 °F | 2.58 in. |
| May | 39.1 °F | 63.6 °F | 3.27 in. |
| June | 48.9 °F | 73.2 °F | 3.24 in. |
| July | 53.8 °F | 77.3 °F | 3.53 in. |
| August | 52.4 °F | 75.7 °F | 3.08 in. |
| September | 45.5 °F | 67.7 °F | 3.43 in. |
| October | 34.7 °F | 53.6 °F | 3.67 in. |
| November | 24.3 °F | 38.7 °F | 2.78 in. |
| December | 13.3 °F | 27.2 °F | 2.67 in. |
| Annual | 30.4 °F | 50.9 °F | 34.3 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |