Fowler, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 17 °C (high). Annual precipitation averages 996.4 Millimeters. Fowler is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 1.4 °C | 46.48 mm |
| February | -5.8 °C | 4.2 °C | 51.31 mm |
| March | -0.3 °C | 10.7 °C | 65.53 mm |
| April | 5.7 °C | 17.5 °C | 102.87 mm |
| May | 12 °C | 22.9 °C | 126.24 mm |
| June | 17.2 °C | 28 °C | 118.36 mm |
| July | 19.2 °C | 30.1 °C | 99.31 mm |
| August | 17.9 °C | 29.3 °C | 97.79 mm |
| September | 13.2 °C | 25.8 °C | 87.63 mm |
| October | 6.8 °C | 18.8 °C | 81.53 mm |
| November | 0.7 °C | 10.9 °C | 68.07 mm |
| December | -4.7 °C | 4.1 °C | 51.31 mm |
| Annual | 6.2 °C | 17 °C | 996.43 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |