Ithaca, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 13.6 °C (high). Annual precipitation averages 872.7 Millimeters. Ithaca 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 | -9.6 °C | -1.7 °C | 54.86 mm |
| February | -9.4 °C | -0.3 °C | 45.47 mm |
| March | -4.9 °C | 5.6 °C | 52.58 mm |
| April | 1.3 °C | 13.2 °C | 88.9 mm |
| May | 7.9 °C | 19.9 °C | 96.01 mm |
| June | 13.3 °C | 25.3 °C | 90.93 mm |
| July | 15.1 °C | 27.4 °C | 80.26 mm |
| August | 14.2 °C | 26.4 °C | 91.44 mm |
| September | 9.8 °C | 22.8 °C | 71.37 mm |
| October | 3.9 °C | 15.4 °C | 83.31 mm |
| November | -1.1 °C | 7.9 °C | 65.53 mm |
| December | -5.8 °C | 1.4 °C | 52.07 mm |
| Annual | 2.9 °C | 13.6 °C | 872.73 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |