Jenison, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 13.8 °C (high). Annual precipitation averages 1029 Millimeters. Jenison is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | -0.8 °C | 80.77 mm |
| February | -7.7 °C | 0.4 °C | 60.96 mm |
| March | -3.6 °C | 6.2 °C | 63.5 mm |
| April | 2.3 °C | 13.2 °C | 102.87 mm |
| May | 8.3 °C | 19.6 °C | 108.2 mm |
| June | 13.8 °C | 24.9 °C | 98.3 mm |
| July | 15.7 °C | 27 °C | 86.36 mm |
| August | 15.2 °C | 26.2 °C | 85.85 mm |
| September | 11 °C | 22.8 °C | 87.12 mm |
| October | 5.2 °C | 15.4 °C | 98.3 mm |
| November | -0.2 °C | 8.1 °C | 83.82 mm |
| December | -4.4 °C | 2.1 °C | 72.9 mm |
| Annual | 4 °C | 13.8 °C | 1028.95 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |