Adrian, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 15 °C (high). Annual precipitation averages 899.4 Millimeters. Adrian 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 | -8.7 °C | -0.1 °C | 59.69 mm |
| February | -8.2 °C | 1.6 °C | 50.55 mm |
| March | -3.6 °C | 7.2 °C | 61.72 mm |
| April | 2.4 °C | 14.7 °C | 87.12 mm |
| May | 8.7 °C | 21.2 °C | 97.54 mm |
| June | 14.2 °C | 26.5 °C | 94.49 mm |
| July | 15.9 °C | 28.7 °C | 81.53 mm |
| August | 14.9 °C | 27.6 °C | 84.84 mm |
| September | 10.7 °C | 24.2 °C | 77.72 mm |
| October | 4.6 °C | 16.9 °C | 73.41 mm |
| November | -0.8 °C | 9.1 °C | 71.63 mm |
| December | -5.3 °C | 2.7 °C | 59.18 mm |
| Annual | 3.7 °C | 15 °C | 899.42 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |