West Liberty, 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 60.2 °F (high). Annual precipitation averages 37.8 Inches. West 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 | 13.8 °F | 30.3 °F | 1.32 in. |
| February | 17.3 °F | 34.7 °F | 1.59 in. |
| March | 28.2 °F | 47.8 °F | 2.36 in. |
| April | 39.4 °F | 61.7 °F | 3.71 in. |
| May | 51.3 °F | 72.4 °F | 4.82 in. |
| June | 61.3 °F | 81.7 °F | 5.13 in. |
| July | 64.7 °F | 85.0 °F | 4.24 in. |
| August | 62.2 °F | 83.1 °F | 4.15 in. |
| September | 53.7 °F | 77.3 °F | 3.54 in. |
| October | 41.8 °F | 64.1 °F | 2.92 in. |
| November | 30.0 °F | 48.8 °F | 2.2 in. |
| December | 19.6 °F | 35.5 °F | 1.77 in. |
| Annual | 40.3 °F | 60.2 °F | 37.75 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 |