Trenton, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 58.5 °F (high). Annual precipitation averages 36.3 Inches. Trenton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.7 °F | 32.3 °F | 2.55 in. |
| February | 20.9 °F | 35.0 °F | 2.25 in. |
| March | 28.3 °F | 44.5 °F | 2.7 in. |
| April | 38.9 °F | 57.1 °F | 3.31 in. |
| May | 50.3 °F | 68.8 °F | 3.84 in. |
| June | 60.5 °F | 78.7 °F | 3.22 in. |
| July | 64.9 °F | 82.7 °F | 3.52 in. |
| August | 63.7 °F | 81.1 °F | 3.54 in. |
| September | 56.4 °F | 74.4 °F | 3.3 in. |
| October | 44.9 °F | 61.7 °F | 2.79 in. |
| November | 34.7 °F | 48.4 °F | 2.74 in. |
| December | 26.0 °F | 37.5 °F | 2.52 in. |
| Annual | 42.4 °F | 58.5 °F | 36.28 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |