Lawton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.9 °C (low) to 15.2 °C (high). Annual precipitation averages 759.2 Millimeters. 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 | -12.4 °C | -1.9 °C | 16.26 mm |
| February | -10.1 °C | 0.9 °C | 20.57 mm |
| March | -3.9 °C | 8.2 °C | 40.64 mm |
| April | 2.2 °C | 15.9 °C | 81.28 mm |
| May | 9.2 °C | 22.1 °C | 105.66 mm |
| June | 15.3 °C | 27.7 °C | 117.86 mm |
| July | 17.2 °C | 29.3 °C | 87.12 mm |
| August | 15.8 °C | 28.2 °C | 97.03 mm |
| September | 10.6 °C | 24.8 °C | 75.44 mm |
| October | 3.5 °C | 17.5 °C | 58.42 mm |
| November | -3.7 °C | 8.3 °C | 34.54 mm |
| December | -9.4 °C | 0.8 °C | 24.38 mm |
| Annual | 2.9 °C | 15.2 °C | 759.2 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |