Fidelity, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 17.9 °C (high). Annual precipitation averages 1033.5 Millimeters. Fidelity 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 2.9 °C | 62.48 mm |
| February | -4.1 °C | 5.9 °C | 54.1 mm |
| March | 1 °C | 11.9 °C | 81.28 mm |
| April | 6.8 °C | 18.4 °C | 115.32 mm |
| May | 13 °C | 23.8 °C | 131.06 mm |
| June | 18.1 °C | 28.6 °C | 94.23 mm |
| July | 19.8 °C | 30.3 °C | 88.14 mm |
| August | 18.7 °C | 29.8 °C | 92.96 mm |
| September | 14 °C | 26.4 °C | 84.07 mm |
| October | 7.7 °C | 19.8 °C | 83.06 mm |
| November | 1.7 °C | 11.9 °C | 80.26 mm |
| December | -3.2 °C | 5.6 °C | 66.55 mm |
| Annual | 7.3 °C | 17.9 °C | 1033.51 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |