Pomeroy, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 18.7 °C (high). Annual precipitation averages 1099.1 Millimeters. Pomeroy 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 | -5.2 °C | 4.9 °C | 81.53 mm |
| February | -4.1 °C | 7.1 °C | 74.93 mm |
| March | -0.7 °C | 12.3 °C | 99.06 mm |
| April | 5.1 °C | 19.9 °C | 92.71 mm |
| May | 10.9 °C | 24.4 °C | 111.51 mm |
| June | 15.6 °C | 28.6 °C | 109.22 mm |
| July | 17.8 °C | 30.2 °C | 116.33 mm |
| August | 17 °C | 29.8 °C | 88.65 mm |
| September | 12.9 °C | 26.6 °C | 88.65 mm |
| October | 6.1 °C | 20.3 °C | 77.72 mm |
| November | 0.7 °C | 13.3 °C | 73.15 mm |
| December | -2.5 °C | 7.3 °C | 85.6 mm |
| Annual | 6.1 °C | 18.7 °C | 1099.06 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |