Morristown, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16 °C (high). Annual precipitation averages 1106.7 Millimeters. Morristown 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 | -6.6 °C | 2.1 °C | 85.09 mm |
| February | -5.7 °C | 3.9 °C | 63.75 mm |
| March | -1.6 °C | 9.2 °C | 90.17 mm |
| April | 4.2 °C | 16.5 °C | 99.06 mm |
| May | 9.7 °C | 21.6 °C | 109.22 mm |
| June | 14.8 °C | 26 °C | 124.46 mm |
| July | 17 °C | 28 °C | 106.93 mm |
| August | 15.8 °C | 27.4 °C | 95 mm |
| September | 11.9 °C | 24.2 °C | 93.98 mm |
| October | 5.8 °C | 17.4 °C | 77.98 mm |
| November | 0.6 °C | 10.7 °C | 78.74 mm |
| December | -3.6 °C | 4.7 °C | 82.3 mm |
| Annual | 5.2 °C | 16 °C | 1106.68 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 |