Fieldon, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 18.1 °C (high). Annual precipitation averages 1065.8 Millimeters. Fieldon is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 3.2 °C | 62.74 mm |
| February | -4.3 °C | 6.2 °C | 58.93 mm |
| March | 0.8 °C | 12.1 °C | 82.3 mm |
| April | 6.7 °C | 18.6 °C | 114.81 mm |
| May | 12.7 °C | 23.9 °C | 127 mm |
| June | 17.9 °C | 28.7 °C | 111.76 mm |
| July | 19.7 °C | 30.6 °C | 97.54 mm |
| August | 18.6 °C | 29.9 °C | 90.42 mm |
| September | 13.9 °C | 26.4 °C | 86.11 mm |
| October | 7.4 °C | 20 °C | 81.28 mm |
| November | 1.4 °C | 12.1 °C | 86.61 mm |
| December | -3.5 °C | 5.8 °C | 66.29 mm |
| Annual | 7.1 °C | 18.1 °C | 1065.79 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |