Piqua, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 61.8 °F (high). Annual precipitation averages 41.6 Inches. Piqua is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.9 °F | 35.3 °F | 3.02 in. |
| February | 22.0 °F | 38.9 °F | 2.41 in. |
| March | 30.3 °F | 49.3 °F | 3.18 in. |
| April | 40.7 °F | 62.4 °F | 4.13 in. |
| May | 52.0 °F | 72.8 °F | 4.52 in. |
| June | 61.1 °F | 81.2 °F | 4.51 in. |
| July | 64.0 °F | 84.4 °F | 4.42 in. |
| August | 62.2 °F | 83.2 °F | 3.22 in. |
| September | 54.7 °F | 77.8 °F | 3.09 in. |
| October | 43.4 °F | 65.3 °F | 2.87 in. |
| November | 33.2 °F | 51.3 °F | 3.13 in. |
| December | 25.4 °F | 39.9 °F | 3.12 in. |
| Annual | 42.4 °F | 61.8 °F | 41.62 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |