Grand Haven, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.9 °C (low) to 13.4 °C (high). Annual precipitation averages 902.2 Millimeters. Grand Haven is located in USDA Plant Hardiness Zone 6b. 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 | -6.7 °C | -0.3 °C | 68.07 mm |
| February | -6.3 °C | 0.8 °C | 48.51 mm |
| March | -2.9 °C | 5.6 °C | 53.34 mm |
| April | 2.7 °C | 12.4 °C | 88.9 mm |
| May | 8.7 °C | 18.7 °C | 92.46 mm |
| June | 13.8 °C | 23.8 °C | 86.11 mm |
| July | 16.8 °C | 26 °C | 77.98 mm |
| August | 16.3 °C | 25.5 °C | 78.99 mm |
| September | 12.3 °C | 22.1 °C | 80.26 mm |
| October | 6.5 °C | 15.3 °C | 87.12 mm |
| November | 1.2 °C | 8.3 °C | 74.42 mm |
| December | -3.4 °C | 2.4 °C | 66.04 mm |
| Annual | 4.9 °C | 13.4 °C | 902.2 mm |
| 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |