Jennings, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.1 °C (low) to 12 °C (high). Annual precipitation averages 869.4 Millimeters. Jennings 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 | -11.4 °C | -3.3 °C | 50.04 mm |
| February | -11.7 °C | -1.7 °C | 40.64 mm |
| March | -7.6 °C | 4.1 °C | 49.78 mm |
| April | -0.6 °C | 11.2 °C | 88.39 mm |
| May | 6 °C | 18.6 °C | 90.17 mm |
| June | 11.3 °C | 23.9 °C | 88.14 mm |
| July | 13.5 °C | 26.2 °C | 81.79 mm |
| August | 12.7 °C | 25.2 °C | 82.04 mm |
| September | 8.3 °C | 21.1 °C | 79.76 mm |
| October | 2.7 °C | 13.3 °C | 95.5 mm |
| November | -2.4 °C | 5.8 °C | 68.83 mm |
| December | -7.4 °C | -0.4 °C | 54.36 mm |
| Annual | 1.1 °C | 12 °C | 869.44 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |