Luther, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.3 °F (low) to 55.2 °F (high). Annual precipitation averages 35.9 Inches. Luther is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.7 °F | 27.7 °F | 2.41 in. |
| February | 12.1 °F | 30.7 °F | 1.8 in. |
| March | 19.5 °F | 41.1 °F | 2.19 in. |
| April | 31.1 °F | 54.4 °F | 3.57 in. |
| May | 42.7 °F | 67.3 °F | 3.57 in. |
| June | 52.3 °F | 76.6 °F | 3.61 in. |
| July | 56.0 °F | 80.6 °F | 3.18 in. |
| August | 54.4 °F | 78.6 °F | 3.31 in. |
| September | 47.0 °F | 71.5 °F | 3.2 in. |
| October | 36.8 °F | 57.7 °F | 3.81 in. |
| November | 27.7 °F | 43.8 °F | 2.95 in. |
| December | 19.4 °F | 32.9 °F | 2.27 in. |
| Annual | 34.3 °F | 55.2 °F | 35.87 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |