Sparta, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.9 °F (low) to 56.6 °F (high). Annual precipitation averages 37.7 Inches. Sparta 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.4 °F | 29.7 °F | 2.52 in. |
| February | 16.6 °F | 32.5 °F | 1.96 in. |
| March | 23.8 °F | 42.6 °F | 2.41 in. |
| April | 34.7 °F | 55.6 °F | 3.77 in. |
| May | 46.0 °F | 67.6 °F | 4.12 in. |
| June | 55.5 °F | 77.2 °F | 3.73 in. |
| July | 59.5 °F | 81.1 °F | 3.19 in. |
| August | 58.1 °F | 79.6 °F | 3.31 in. |
| September | 50.4 °F | 72.8 °F | 3.19 in. |
| October | 39.8 °F | 59.5 °F | 3.75 in. |
| November | 30.9 °F | 45.9 °F | 3.28 in. |
| December | 22.8 °F | 34.7 °F | 2.49 in. |
| Annual | 37.9 °F | 56.6 °F | 37.72 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |