Anthon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.6 °F (low) to 59.1 °F (high). Annual precipitation averages 31.4 Inches. Anthon is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.3 °F | 28.5 °F | 0.71 in. |
| February | 13.5 °F | 33.3 °F | 0.86 in. |
| March | 24.6 °F | 46.7 °F | 1.71 in. |
| April | 35.3 °F | 60.5 °F | 3.3 in. |
| May | 47.8 °F | 71.6 °F | 4.29 in. |
| June | 58.9 °F | 81.6 °F | 4.92 in. |
| July | 62.4 °F | 84.5 °F | 3.8 in. |
| August | 59.9 °F | 82.3 °F | 4.16 in. |
| September | 50.5 °F | 76.5 °F | 2.93 in. |
| October | 37.7 °F | 63.4 °F | 2.3 in. |
| November | 24.8 °F | 46.9 °F | 1.38 in. |
| December | 14.7 °F | 33.5 °F | 1.05 in. |
| Annual | 36.6 °F | 59.1 °F | 31.41 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |