Williamsport, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.6 °F (low) to 62.8 °F (high). Annual precipitation averages 40.9 Inches. Williamsport is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.2 °F | 37.3 °F | 2.93 in. |
| February | 22.9 °F | 40.4 °F | 2.49 in. |
| March | 30.5 °F | 50.5 °F | 3.53 in. |
| April | 41.1 °F | 63.4 °F | 4.02 in. |
| May | 52.0 °F | 73.5 °F | 4.38 in. |
| June | 60.9 °F | 81.6 °F | 4.64 in. |
| July | 63.8 °F | 84.4 °F | 3.97 in. |
| August | 61.6 °F | 83.6 °F | 3.35 in. |
| September | 54.0 °F | 78.1 °F | 2.86 in. |
| October | 43.2 °F | 65.8 °F | 2.88 in. |
| November | 33.1 °F | 52.6 °F | 2.95 in. |
| December | 26.6 °F | 41.8 °F | 2.88 in. |
| Annual | 42.6 °F | 62.8 °F | 40.88 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |