Story City, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 14.7 °C (high). Annual precipitation averages 938 Millimeters. Story City 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 | -12 °C | -2.3 °C | 24.64 mm |
| February | -9.8 °C | 0.3 °C | 29.46 mm |
| March | -3.3 °C | 7.6 °C | 52.83 mm |
| April | 2.9 °C | 15.6 °C | 95.5 mm |
| May | 9.7 °C | 21.5 °C | 127.51 mm |
| June | 15.5 °C | 26.9 °C | 140.97 mm |
| July | 17.4 °C | 28.8 °C | 113.79 mm |
| August | 16 °C | 27.5 °C | 117.09 mm |
| September | 11.2 °C | 24.4 °C | 86.11 mm |
| October | 4.2 °C | 17 °C | 66.8 mm |
| November | -2.6 °C | 8.3 °C | 46.23 mm |
| December | -8.6 °C | 0.8 °C | 37.08 mm |
| Annual | 3.4 °C | 14.7 °C | 938.01 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |