Loomis, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.2 °F (low) to 56.6 °F (high). Annual precipitation averages 33.4 Inches. Loomis 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 | 14.0 °F | 29.2 °F | 2.06 in. |
| February | 14.0 °F | 31.9 °F | 1.6 in. |
| March | 21.9 °F | 42.2 °F | 1.98 in. |
| April | 33.1 °F | 55.6 °F | 3.39 in. |
| May | 44.9 °F | 68.4 °F | 3.64 in. |
| June | 54.9 °F | 77.9 °F | 3.6 in. |
| July | 58.4 °F | 81.9 °F | 3.0 in. |
| August | 56.5 °F | 79.9 °F | 3.48 in. |
| September | 48.3 °F | 72.9 °F | 2.77 in. |
| October | 38.1 °F | 59.3 °F | 3.31 in. |
| November | 29.1 °F | 45.8 °F | 2.53 in. |
| December | 20.9 °F | 34.5 °F | 1.99 in. |
| Annual | 36.2 °F | 56.6 °F | 33.35 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |