Lineville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.8 °F (low) to 60.6 °F (high). Annual precipitation averages 38.7 Inches. Lineville 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 | 13.5 °F | 32.0 °F | 1.01 in. |
| February | 17.4 °F | 37.1 °F | 1.3 in. |
| March | 28.0 °F | 49.7 °F | 2.23 in. |
| April | 38.8 °F | 61.3 °F | 4.05 in. |
| May | 50.4 °F | 71.1 °F | 5.44 in. |
| June | 60.3 °F | 80.5 °F | 5.08 in. |
| July | 64.7 °F | 84.9 °F | 4.68 in. |
| August | 62.1 °F | 83.3 °F | 4.56 in. |
| September | 53.1 °F | 76.4 °F | 3.81 in. |
| October | 41.1 °F | 64.0 °F | 3.06 in. |
| November | 29.1 °F | 49.3 °F | 1.92 in. |
| December | 18.9 °F | 37.1 °F | 1.51 in. |
| Annual | 39.8 °F | 60.6 °F | 38.65 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 |