Bankston, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.9 °F (low) to 55.5 °F (high). Annual precipitation averages 39 Inches. Bankston is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.4 °F | 25.2 °F | 1.26 in. |
| February | 13.1 °F | 29.7 °F | 1.41 in. |
| March | 24.6 °F | 42.6 °F | 2.11 in. |
| April | 35.9 °F | 56.5 °F | 3.91 in. |
| May | 47.8 °F | 68.0 °F | 4.64 in. |
| June | 58.0 °F | 77.6 °F | 5.89 in. |
| July | 61.5 °F | 80.7 °F | 4.86 in. |
| August | 59.3 °F | 79.0 °F | 4.18 in. |
| September | 50.8 °F | 72.3 °F | 3.87 in. |
| October | 38.8 °F | 59.5 °F | 2.95 in. |
| November | 27.0 °F | 43.8 °F | 2.25 in. |
| December | 16.2 °F | 31.0 °F | 1.69 in. |
| Annual | 36.9 °F | 55.5 °F | 39.02 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |