New Liberty, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.3 °F (low) to 59 °F (high). Annual precipitation averages 38.1 Inches. New Liberty 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 | 12.6 °F | 29.1 °F | 1.39 in. |
| February | 16.2 °F | 33.6 °F | 1.64 in. |
| March | 27.1 °F | 46.6 °F | 2.43 in. |
| April | 38.2 °F | 60.2 °F | 3.78 in. |
| May | 50.2 °F | 71.3 °F | 4.71 in. |
| June | 60.2 °F | 80.6 °F | 4.98 in. |
| July | 63.6 °F | 83.6 °F | 4.28 in. |
| August | 61.3 °F | 81.9 °F | 4.19 in. |
| September | 52.9 °F | 76.1 °F | 3.66 in. |
| October | 41.1 °F | 63.0 °F | 2.96 in. |
| November | 29.2 °F | 47.9 °F | 2.23 in. |
| December | 18.8 °F | 34.6 °F | 1.81 in. |
| Annual | 39.3 °F | 59 °F | 38.06 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |