Cascade, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.4 °F (low) to 57.9 °F (high). Annual precipitation averages 38.8 Inches. 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 | 10.3 °F | 27.4 °F | 1.21 in. |
| February | 13.9 °F | 31.8 °F | 1.49 in. |
| March | 25.6 °F | 45.0 °F | 2.2 in. |
| April | 36.4 °F | 59.2 °F | 3.79 in. |
| May | 48.2 °F | 70.6 °F | 4.22 in. |
| June | 58.7 °F | 80.0 °F | 5.95 in. |
| July | 62.0 °F | 83.1 °F | 4.69 in. |
| August | 59.7 °F | 81.5 °F | 4.59 in. |
| September | 50.7 °F | 74.7 °F | 3.52 in. |
| October | 38.9 °F | 61.8 °F | 3.13 in. |
| November | 27.5 °F | 46.1 °F | 2.3 in. |
| December | 17.1 °F | 33.2 °F | 1.7 in. |
| Annual | 37.4 °F | 57.9 °F | 38.79 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 |