Tustin, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.6 °F (low) to 54.4 °F (high). Annual precipitation averages 35.4 Inches. Tustin is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.2 °F | 26.9 °F | 2.3 in. |
| February | 10.7 °F | 30.0 °F | 1.73 in. |
| March | 18.3 °F | 40.3 °F | 2.1 in. |
| April | 30.3 °F | 53.2 °F | 3.55 in. |
| May | 42.2 °F | 66.3 °F | 3.59 in. |
| June | 51.8 °F | 75.9 °F | 3.58 in. |
| July | 55.5 °F | 79.8 °F | 3.21 in. |
| August | 54.2 °F | 77.9 °F | 3.38 in. |
| September | 46.3 °F | 70.7 °F | 3.17 in. |
| October | 36.3 °F | 56.9 °F | 3.7 in. |
| November | 27.3 °F | 43.1 °F | 2.89 in. |
| December | 18.6 °F | 32.2 °F | 2.21 in. |
| Annual | 33.6 °F | 54.4 °F | 35.41 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| 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 |