Jennings, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34 °F (low) to 53.6 °F (high). Annual precipitation averages 34.2 Inches. 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 °F | 26.1 °F | 1.97 in. |
| February | 10.9 °F | 28.9 °F | 1.6 in. |
| March | 18.3 °F | 39.3 °F | 1.96 in. |
| April | 30.9 °F | 52.1 °F | 3.48 in. |
| May | 42.8 °F | 65.5 °F | 3.55 in. |
| June | 52.3 °F | 75.1 °F | 3.47 in. |
| July | 56.3 °F | 79.1 °F | 3.22 in. |
| August | 54.8 °F | 77.3 °F | 3.23 in. |
| September | 47.0 °F | 70.0 °F | 3.14 in. |
| October | 36.9 °F | 56.0 °F | 3.76 in. |
| November | 27.6 °F | 42.5 °F | 2.71 in. |
| December | 18.6 °F | 31.3 °F | 2.14 in. |
| Annual | 34 °F | 53.6 °F | 34.23 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |