Danville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.3 °C (high). Annual precipitation averages 982.2 Millimeters. Danville is located in USDA Plant Hardiness Zone 6a. 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 | -9 °C | 0.1 °C | 40.89 mm |
| February | -6.9 °C | 2.8 °C | 46.74 mm |
| March | -1.3 °C | 9.8 °C | 64.26 mm |
| April | 4.8 °C | 16.9 °C | 96.27 mm |
| May | 11.4 °C | 22.7 °C | 131.06 mm |
| June | 16.7 °C | 27.8 °C | 122.43 mm |
| July | 18.7 °C | 29.7 °C | 105.16 mm |
| August | 17.6 °C | 28.9 °C | 97.03 mm |
| September | 12.8 °C | 25.4 °C | 93.73 mm |
| October | 6.3 °C | 18.4 °C | 75.18 mm |
| November | -0.2 °C | 9.9 °C | 61.47 mm |
| December | -5.7 °C | 3.1 °C | 48.01 mm |
| Annual | 5.4 °C | 16.3 °C | 982.23 mm |
| 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 6a : -23.3°C to -20.6°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 |