Mecosta, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 13.1 °C (high). Annual precipitation averages 909.1 Millimeters. Mecosta is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | -2.1 °C | 58.67 mm |
| February | -10.3 °C | -0.6 °C | 46.48 mm |
| March | -5.8 °C | 5.3 °C | 56.9 mm |
| April | 0.5 °C | 12.7 °C | 92.96 mm |
| May | 7.1 °C | 19.4 °C | 98.3 mm |
| June | 12.6 °C | 24.8 °C | 89.92 mm |
| July | 14.2 °C | 26.9 °C | 81.28 mm |
| August | 13.3 °C | 26.1 °C | 92.2 mm |
| September | 9.3 °C | 22.1 °C | 75.69 mm |
| October | 3.2 °C | 14.6 °C | 89.15 mm |
| November | -1.9 °C | 7.1 °C | 71.63 mm |
| December | -6.4 °C | 0.8 °C | 55.88 mm |
| Annual | 2.1 °C | 13.1 °C | 909.06 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |