Cantril, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 16.6 °C (high). Annual precipitation averages 971.1 Millimeters. Cantril 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 | -9.1 °C | 0.4 °C | 36.58 mm |
| February | -7.2 °C | 3 °C | 45.47 mm |
| March | -1.2 °C | 10.1 °C | 57.4 mm |
| April | 4.7 °C | 17.4 °C | 94.74 mm |
| May | 11.2 °C | 22.9 °C | 138.43 mm |
| June | 16.7 °C | 28.1 °C | 124.46 mm |
| July | 18.7 °C | 30.1 °C | 107.19 mm |
| August | 17.4 °C | 29.3 °C | 95.76 mm |
| September | 12.6 °C | 25.6 °C | 94.23 mm |
| October | 6.1 °C | 18.4 °C | 75.95 mm |
| November | -0.3 °C | 10.1 °C | 57.66 mm |
| December | -5.8 °C | 3.2 °C | 43.18 mm |
| Annual | 5.3 °C | 16.6 °C | 971.05 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |