Tustin, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 55.4 °F (high). Annual precipitation averages 33.7 Inches. Tustin is located in USDA Plant Hardiness Zone 5a. 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 | 9.5 °F | 25.8 °F | 1.36 in. |
| February | 11.6 °F | 29.7 °F | 1.17 in. |
| March | 22.0 °F | 41.3 °F | 1.93 in. |
| April | 34.0 °F | 55.1 °F | 3.49 in. |
| May | 46.2 °F | 67.6 °F | 4.0 in. |
| June | 56.6 °F | 77.4 °F | 4.63 in. |
| July | 60.6 °F | 82.0 °F | 3.7 in. |
| August | 58.6 °F | 79.9 °F | 3.71 in. |
| September | 50.2 °F | 72.4 °F | 3.27 in. |
| October | 38.4 °F | 58.7 °F | 2.78 in. |
| November | 27.4 °F | 44.1 °F | 1.9 in. |
| December | 16.3 °F | 31.3 °F | 1.71 in. |
| Annual | 36 °F | 55.4 °F | 33.65 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |