Trenton, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 63.2 °F (high). Annual precipitation averages 40.1 Inches. Trenton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.3 °F | 34.8 °F | 1.18 in. |
| February | 20.3 °F | 40.1 °F | 1.64 in. |
| March | 30.5 °F | 52.2 °F | 2.41 in. |
| April | 41.1 °F | 63.6 °F | 3.91 in. |
| May | 52.6 °F | 73.7 °F | 5.71 in. |
| June | 62.5 °F | 83.5 °F | 5.15 in. |
| July | 66.5 °F | 87.5 °F | 4.86 in. |
| August | 64.0 °F | 85.9 °F | 4.17 in. |
| September | 55.1 °F | 78.9 °F | 4.08 in. |
| October | 43.0 °F | 66.2 °F | 3.08 in. |
| November | 31.6 °F | 52.2 °F | 2.23 in. |
| December | 21.4 °F | 39.5 °F | 1.68 in. |
| Annual | 42.1 °F | 63.2 °F | 40.1 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |