Deer Creek, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16.5 °C (high). Annual precipitation averages 974.3 Millimeters. Deer Creek is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9 °C | 0.4 °C | 55.37 mm |
| February | -7.1 °C | 3.1 °C | 50.04 mm |
| March | -1.7 °C | 9.8 °C | 65.53 mm |
| April | 4.3 °C | 17.2 °C | 96.01 mm |
| May | 10.7 °C | 23.1 °C | 118.36 mm |
| June | 16.1 °C | 27.9 °C | 109.47 mm |
| July | 17.8 °C | 29.7 °C | 97.54 mm |
| August | 16.7 °C | 28.8 °C | 91.19 mm |
| September | 12.2 °C | 26.1 °C | 84.58 mm |
| October | 5.8 °C | 18.7 °C | 79.76 mm |
| November | -0.4 °C | 10.4 °C | 71.88 mm |
| December | -5.8 °C | 3.3 °C | 54.61 mm |
| Annual | 5 °C | 16.5 °C | 974.34 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |