Trenton, Utah has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.9 °C (low) to 15.7 °C (high). Annual precipitation averages 434.6 Millimeters. Trenton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | 0.2 °C | 43.94 mm |
| February | -8 °C | 2.9 °C | 38.61 mm |
| March | -2.7 °C | 9.7 °C | 41.66 mm |
| April | 0.7 °C | 14.8 °C | 48.01 mm |
| May | 4.8 °C | 20.1 °C | 58.93 mm |
| June | 8.3 °C | 26.2 °C | 29.97 mm |
| July | 12.1 °C | 31.8 °C | 15.49 mm |
| August | 11.2 °C | 31 °C | 20.57 mm |
| September | 6.3 °C | 25.3 °C | 32.26 mm |
| October | 0.6 °C | 17.1 °C | 36.83 mm |
| November | -4.3 °C | 8.3 °C | 30.23 mm |
| December | -8.9 °C | 0.9 °C | 38.1 mm |
| Annual | 0.9 °C | 15.7 °C | 434.6 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |