Cantril, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.6 °F (low) to 61.8 °F (high). Annual precipitation averages 38.2 Inches. 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 | 15.7 °F | 32.8 °F | 1.44 in. |
| February | 19.1 °F | 37.4 °F | 1.79 in. |
| March | 29.8 °F | 50.2 °F | 2.26 in. |
| April | 40.5 °F | 63.3 °F | 3.73 in. |
| May | 52.2 °F | 73.2 °F | 5.45 in. |
| June | 62.0 °F | 82.5 °F | 4.9 in. |
| July | 65.7 °F | 86.2 °F | 4.22 in. |
| August | 63.4 °F | 84.8 °F | 3.77 in. |
| September | 54.6 °F | 78.1 °F | 3.71 in. |
| October | 43.0 °F | 65.2 °F | 2.99 in. |
| November | 31.4 °F | 50.2 °F | 2.27 in. |
| December | 21.5 °F | 37.7 °F | 1.7 in. |
| Annual | 41.6 °F | 61.8 °F | 38.23 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |