New Trenton, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.9 °C (high). Annual precipitation averages 1144.8 Millimeters. New 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 | -5.4 °C | 3.9 °C | 85.34 mm |
| February | -4.4 °C | 6.1 °C | 70.1 mm |
| March | 0.1 °C | 11.6 °C | 97.54 mm |
| April | 5.6 °C | 18.4 °C | 119.63 mm |
| May | 11.5 °C | 23.6 °C | 127.51 mm |
| June | 16.4 °C | 28 °C | 119.13 mm |
| July | 18.2 °C | 29.7 °C | 102.36 mm |
| August | 17.4 °C | 29.6 °C | 83.57 mm |
| September | 12.9 °C | 26.2 °C | 78.99 mm |
| October | 6.3 °C | 19.4 °C | 83.57 mm |
| November | 0.8 °C | 12.3 °C | 84.58 mm |
| December | -2.8 °C | 6.1 °C | 92.46 mm |
| Annual | 6.4 °C | 17.9 °C | 1144.78 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |