Davenport, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.7 °C (high). Annual precipitation averages 966.7 Millimeters. Davenport 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | -0.8 °C | 38.61 mm |
| February | -7.7 °C | 1.7 °C | 45.21 mm |
| March | -1.7 °C | 8.9 °C | 64.77 mm |
| April | 4.5 °C | 16.3 °C | 93.73 mm |
| May | 11.1 °C | 22.4 °C | 123.19 mm |
| June | 16.6 °C | 27.6 °C | 122.94 mm |
| July | 18.6 °C | 29.3 °C | 108.2 mm |
| August | 17.4 °C | 28.3 °C | 101.35 mm |
| September | 12.9 °C | 25 °C | 87.12 mm |
| October | 6.3 °C | 17.8 °C | 72.9 mm |
| November | -0.4 °C | 9.4 °C | 57.91 mm |
| December | -6.3 °C | 2.2 °C | 50.8 mm |
| Annual | 5.1 °C | 15.7 °C | 966.73 mm |
| 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 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 |