Clio, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 15.7 °C (high). Annual precipitation averages 985.8 Millimeters. Clio is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.4 °C | -0.2 °C | 26.92 mm |
| February | -8.2 °C | 2.7 °C | 35.31 mm |
| March | -2.3 °C | 9.7 °C | 56.9 mm |
| April | 3.6 °C | 16.1 °C | 100.84 mm |
| May | 10.1 °C | 21.5 °C | 138.68 mm |
| June | 15.6 °C | 26.8 °C | 136.14 mm |
| July | 18 °C | 29.3 °C | 116.59 mm |
| August | 16.6 °C | 28.3 °C | 111.51 mm |
| September | 11.5 °C | 24.7 °C | 97.03 mm |
| October | 4.8 °C | 17.7 °C | 76.96 mm |
| November | -1.9 °C | 9.4 °C | 50.55 mm |
| December | -7.3 °C | 2.8 °C | 38.35 mm |
| Annual | 4.2 °C | 15.7 °C | 985.78 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |