Bancroft, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 13.3 °C (high). Annual precipitation averages 833.1 Millimeters. Bancroft is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.7 °C | -4.4 °C | 20.07 mm |
| February | -11.4 °C | -2 °C | 23.37 mm |
| March | -4.6 °C | 5.2 °C | 46.74 mm |
| April | 2 °C | 14.2 °C | 88.39 mm |
| May | 9 °C | 20.8 °C | 114.81 mm |
| June | 15.1 °C | 26.4 °C | 126.75 mm |
| July | 16.9 °C | 27.9 °C | 107.7 mm |
| August | 15.4 °C | 26.7 °C | 96.77 mm |
| September | 10.6 °C | 23.5 °C | 81.28 mm |
| October | 3.4 °C | 15.8 °C | 59.94 mm |
| November | -3.7 °C | 6.3 °C | 37.59 mm |
| December | -9.9 °C | -1.4 °C | 29.72 mm |
| Annual | 2.4 °C | 13.3 °C | 833.13 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |