Fountain, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.2 °F (low) to 55.6 °F (high). Annual precipitation averages 35.7 Inches. Fountain is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.6 °F | 29.1 °F | 2.51 in. |
| February | 15.8 °F | 31.9 °F | 1.83 in. |
| March | 21.8 °F | 41.6 °F | 2.22 in. |
| April | 32.5 °F | 54.3 °F | 3.35 in. |
| May | 43.5 °F | 67.1 °F | 3.48 in. |
| June | 53.0 °F | 76.2 °F | 3.42 in. |
| July | 57.2 °F | 79.7 °F | 2.92 in. |
| August | 55.7 °F | 78.2 °F | 3.19 in. |
| September | 48.5 °F | 71.5 °F | 3.05 in. |
| October | 38.3 °F | 58.6 °F | 3.94 in. |
| November | 29.9 °F | 44.7 °F | 3.16 in. |
| December | 22.0 °F | 34.0 °F | 2.59 in. |
| Annual | 36.2 °F | 55.6 °F | 35.66 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |