Eureka, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.7 °F (low) to 57.5 °F (high). Annual precipitation averages 33.8 Inches. Eureka is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 30.0 °F | 2.17 in. |
| February | 15.7 °F | 32.6 °F | 1.79 in. |
| March | 24.1 °F | 43.3 °F | 2.04 in. |
| April | 34.8 °F | 56.5 °F | 3.39 in. |
| May | 46.5 °F | 68.9 °F | 3.86 in. |
| June | 56.3 °F | 78.5 °F | 3.41 in. |
| July | 59.6 °F | 82.3 °F | 3.14 in. |
| August | 57.9 °F | 80.4 °F | 3.37 in. |
| September | 50.1 °F | 74.1 °F | 2.97 in. |
| October | 39.7 °F | 61.0 °F | 3.17 in. |
| November | 30.5 °F | 47.0 °F | 2.52 in. |
| December | 22.0 °F | 35.3 °F | 1.96 in. |
| Annual | 37.7 °F | 57.5 °F | 33.79 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |