Lucas, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.6 °F (low) to 60.8 °F (high). Annual precipitation averages 38 Inches. Lucas is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.5 °F | 31.3 °F | 1.01 in. |
| February | 16.7 °F | 36.0 °F | 1.37 in. |
| March | 27.4 °F | 48.9 °F | 2.15 in. |
| April | 38.6 °F | 62.5 °F | 3.97 in. |
| May | 50.4 °F | 72.3 °F | 5.42 in. |
| June | 60.3 °F | 81.6 °F | 5.23 in. |
| July | 64.5 °F | 85.8 °F | 4.49 in. |
| August | 62.0 °F | 84.1 °F | 4.36 in. |
| September | 53.3 °F | 77.2 °F | 3.73 in. |
| October | 41.1 °F | 64.2 °F | 2.82 in. |
| November | 29.1 °F | 48.9 °F | 2.01 in. |
| December | 18.8 °F | 36.6 °F | 1.43 in. |
| Annual | 39.6 °F | 60.8 °F | 37.99 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |