Lawler, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.2 °C (low) to 13.4 °C (high). Annual precipitation averages 961.9 Millimeters. Lawler 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 | -13.4 °C | -3.9 °C | 26.67 mm |
| February | -11.3 °C | -1.6 °C | 28.7 mm |
| March | -4.7 °C | 5.7 °C | 51.31 mm |
| April | 1.8 °C | 14 °C | 100.58 mm |
| May | 8.5 °C | 20.7 °C | 120.65 mm |
| June | 14.4 °C | 26.1 °C | 155.7 mm |
| July | 16.3 °C | 27.7 °C | 120.9 mm |
| August | 14.8 °C | 26.6 °C | 104.9 mm |
| September | 10.2 °C | 23.2 °C | 97.03 mm |
| October | 3.3 °C | 15.8 °C | 70.36 mm |
| November | -3.4 °C | 6.7 °C | 46.48 mm |
| December | -9.7 °C | -0.8 °C | 38.61 mm |
| Annual | 2.2 °C | 13.4 °C | 961.89 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |