Boxholm, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.8 °F (low) to 58.1 °F (high). Annual precipitation averages 35.9 Inches. Boxholm 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 | 9.8 °F | 27.4 °F | 0.92 in. |
| February | 13.9 °F | 32.0 °F | 1.14 in. |
| March | 25.5 °F | 45.3 °F | 2.04 in. |
| April | 36.6 °F | 59.8 °F | 3.75 in. |
| May | 49.2 °F | 70.6 °F | 5.05 in. |
| June | 59.9 °F | 80.3 °F | 5.35 in. |
| July | 63.3 °F | 83.5 °F | 4.32 in. |
| August | 60.8 °F | 81.2 °F | 4.34 in. |
| September | 51.9 °F | 75.7 °F | 3.22 in. |
| October | 39.3 °F | 62.6 °F | 2.68 in. |
| November | 26.9 °F | 46.4 °F | 1.75 in. |
| December | 16.0 °F | 32.8 °F | 1.36 in. |
| Annual | 37.8 °F | 58.1 °F | 35.92 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |