Grand Haven, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.8 °F (low) to 56.1 °F (high). Annual precipitation averages 35.5 Inches. 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 | 20.0 °F | 31.4 °F | 2.68 in. |
| February | 20.6 °F | 33.5 °F | 1.91 in. |
| March | 26.8 °F | 42.1 °F | 2.1 in. |
| April | 36.8 °F | 54.4 °F | 3.5 in. |
| May | 47.6 °F | 65.6 °F | 3.64 in. |
| June | 56.9 °F | 74.9 °F | 3.39 in. |
| July | 62.2 °F | 78.8 °F | 3.07 in. |
| August | 61.3 °F | 77.9 °F | 3.11 in. |
| September | 54.2 °F | 71.8 °F | 3.16 in. |
| October | 43.7 °F | 59.5 °F | 3.43 in. |
| November | 34.1 °F | 46.9 °F | 2.93 in. |
| December | 25.9 °F | 36.4 °F | 2.6 in. |
| Annual | 40.8 °F | 56.1 °F | 35.52 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |