Lawton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.1 °F (low) to 59.3 °F (high). Annual precipitation averages 29.9 Inches. Lawton is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.6 °F | 28.6 °F | 0.64 in. |
| February | 13.9 °F | 33.6 °F | 0.81 in. |
| March | 24.9 °F | 46.8 °F | 1.6 in. |
| April | 35.9 °F | 60.6 °F | 3.2 in. |
| May | 48.5 °F | 71.7 °F | 4.16 in. |
| June | 59.5 °F | 81.8 °F | 4.64 in. |
| July | 63.0 °F | 84.8 °F | 3.43 in. |
| August | 60.5 °F | 82.7 °F | 3.82 in. |
| September | 51.1 °F | 76.6 °F | 2.97 in. |
| October | 38.3 °F | 63.5 °F | 2.3 in. |
| November | 25.3 °F | 47.0 °F | 1.36 in. |
| December | 15.0 °F | 33.4 °F | 0.96 in. |
| Annual | 37.1 °F | 59.3 °F | 29.89 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |