Constantine, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 14.9 °C (high). Annual precipitation averages 959.1 Millimeters. Constantine is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.4 °C | -0.3 °C | 68.58 mm |
| February | -7.7 °C | 1.6 °C | 48.01 mm |
| March | -3.1 °C | 7.6 °C | 59.69 mm |
| April | 2.7 °C | 14.7 °C | 86.61 mm |
| May | 9.2 °C | 21.2 °C | 102.36 mm |
| June | 14.6 °C | 26.3 °C | 103.89 mm |
| July | 16.2 °C | 28.3 °C | 93.22 mm |
| August | 15.2 °C | 27.3 °C | 102.87 mm |
| September | 10.9 °C | 23.9 °C | 83.82 mm |
| October | 4.8 °C | 16.6 °C | 85.6 mm |
| November | -0.3 °C | 8.9 °C | 69.09 mm |
| December | -5 °C | 2.6 °C | 55.37 mm |
| Annual | 4.1 °C | 14.9 °C | 959.11 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |