Wesley, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.3 °C (low) to 13.2 °C (high). Annual precipitation averages 855.7 Millimeters. Wesley 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 | -13.7 °C | -4.3 °C | 20.57 mm |
| February | -11.2 °C | -1.8 °C | 24.38 mm |
| March | -4.6 °C | 5.4 °C | 50.55 mm |
| April | 1.8 °C | 14 °C | 94.74 mm |
| May | 8.8 °C | 20.7 °C | 118.87 mm |
| June | 14.8 °C | 26.2 °C | 130.81 mm |
| July | 16.6 °C | 27.8 °C | 107.44 mm |
| August | 15.1 °C | 26.5 °C | 99.31 mm |
| September | 10.3 °C | 23.2 °C | 78.74 mm |
| October | 3.3 °C | 15.8 °C | 58.42 mm |
| November | -3.6 °C | 6.5 °C | 40.64 mm |
| December | -10.1 °C | -1.2 °C | 31.24 mm |
| Annual | 2.3 °C | 13.2 °C | 855.71 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |