Fowler, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 62.6 °F (high). Annual precipitation averages 39.2 Inches. 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 | 18.1 °F | 34.6 °F | 1.83 in. |
| February | 21.6 °F | 39.5 °F | 2.02 in. |
| March | 31.4 °F | 51.3 °F | 2.58 in. |
| April | 42.3 °F | 63.5 °F | 4.05 in. |
| May | 53.6 °F | 73.3 °F | 4.97 in. |
| June | 63.0 °F | 82.4 °F | 4.66 in. |
| July | 66.5 °F | 86.2 °F | 3.91 in. |
| August | 64.3 °F | 84.7 °F | 3.85 in. |
| September | 55.7 °F | 78.4 °F | 3.45 in. |
| October | 44.3 °F | 65.9 °F | 3.21 in. |
| November | 33.2 °F | 51.7 °F | 2.68 in. |
| December | 23.5 °F | 39.3 °F | 2.02 in. |
| Annual | 43.1 °F | 62.6 °F | 39.23 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |