Keosauqua, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 17.1 °C (high). Annual precipitation averages 956.1 Millimeters. Keosauqua is located in USDA Plant Hardiness Zone 5b. 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 | -8.6 °C | 0.8 °C | 36.83 mm |
| February | -6.7 °C | 3.4 °C | 46.48 mm |
| March | -0.8 °C | 10.6 °C | 56.13 mm |
| April | 5.3 °C | 18 °C | 94.49 mm |
| May | 11.4 °C | 23.5 °C | 138.43 mm |
| June | 16.7 °C | 28.6 °C | 120.4 mm |
| July | 18.9 °C | 30.7 °C | 102.87 mm |
| August | 17.8 °C | 29.9 °C | 92.2 mm |
| September | 13 °C | 26.2 °C | 93.22 mm |
| October | 6.7 °C | 18.9 °C | 74.93 mm |
| November | 0.2 °C | 10.4 °C | 56.9 mm |
| December | -5.4 °C | 3.6 °C | 43.18 mm |
| Annual | 5.7 °C | 17.1 °C | 956.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |