Boone, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.5 °F (low) to 58.5 °F (high). Annual precipitation averages 37.1 Inches. Boone 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 | 10.7 °F | 27.9 °F | 1.0 in. |
| February | 14.9 °F | 32.6 °F | 1.23 in. |
| March | 26.3 °F | 45.7 °F | 2.08 in. |
| April | 37.5 °F | 60.2 °F | 3.89 in. |
| May | 49.9 °F | 71.0 °F | 5.17 in. |
| June | 60.3 °F | 80.5 °F | 5.35 in. |
| July | 63.7 °F | 83.7 °F | 4.62 in. |
| August | 61.2 °F | 81.4 °F | 4.47 in. |
| September | 52.4 °F | 76.1 °F | 3.25 in. |
| October | 40.0 °F | 63.0 °F | 2.78 in. |
| November | 27.7 °F | 46.9 °F | 1.86 in. |
| December | 16.9 °F | 33.3 °F | 1.43 in. |
| Annual | 38.5 °F | 58.5 °F | 37.13 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 |