Cascade, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 14.4 °C (high). Annual precipitation averages 985.3 Millimeters. Cascade 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 | -12.1 °C | -2.6 °C | 30.73 mm |
| February | -10.1 °C | -0.1 °C | 37.85 mm |
| March | -3.6 °C | 7.2 °C | 55.88 mm |
| April | 2.4 °C | 15.1 °C | 96.27 mm |
| May | 9 °C | 21.4 °C | 107.19 mm |
| June | 14.8 °C | 26.7 °C | 151.13 mm |
| July | 16.7 °C | 28.4 °C | 119.13 mm |
| August | 15.4 °C | 27.5 °C | 116.59 mm |
| September | 10.4 °C | 23.7 °C | 89.41 mm |
| October | 3.8 °C | 16.6 °C | 79.5 mm |
| November | -2.5 °C | 7.8 °C | 58.42 mm |
| December | -8.3 °C | 0.7 °C | 43.18 mm |
| Annual | 3 °C | 14.4 °C | 985.28 mm |
| 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 : -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 |