Cincinnati, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 60.5 °F (high). Annual precipitation averages 39.3 Inches. Cincinnati is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.1 °F | 31.9 °F | 1.17 in. |
| February | 17.8 °F | 36.6 °F | 1.53 in. |
| March | 28.4 °F | 49.4 °F | 2.31 in. |
| April | 39.1 °F | 61.5 °F | 3.96 in. |
| May | 50.8 °F | 71.2 °F | 5.45 in. |
| June | 60.6 °F | 80.7 °F | 5.36 in. |
| July | 64.7 °F | 85.0 °F | 4.62 in. |
| August | 62.3 °F | 83.5 °F | 4.25 in. |
| September | 53.5 °F | 76.5 °F | 3.93 in. |
| October | 41.5 °F | 63.8 °F | 2.96 in. |
| November | 29.5 °F | 49.3 °F | 2.18 in. |
| December | 19.8 °F | 37.0 °F | 1.58 in. |
| Annual | 40.2 °F | 60.5 °F | 39.3 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |