Packwood, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 60.6 °F (high). Annual precipitation averages 38.2 Inches. Packwood is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.0 °F | 31.1 °F | 1.35 in. |
| February | 17.5 °F | 35.6 °F | 1.62 in. |
| March | 28.3 °F | 48.7 °F | 2.29 in. |
| April | 39.3 °F | 62.0 °F | 3.77 in. |
| May | 51.3 °F | 72.1 °F | 5.22 in. |
| June | 61.3 °F | 81.7 °F | 5.18 in. |
| July | 64.9 °F | 85.4 °F | 4.17 in. |
| August | 62.3 °F | 83.5 °F | 4.14 in. |
| September | 53.3 °F | 77.0 °F | 3.64 in. |
| October | 41.6 °F | 64.3 °F | 2.89 in. |
| November | 30.1 °F | 49.0 °F | 2.24 in. |
| December | 20.0 °F | 36.3 °F | 1.67 in. |
| Annual | 40.3 °F | 60.6 °F | 38.18 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 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 |