Coatsburg, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 16.8 °C (high). Annual precipitation averages 996.4 Millimeters. Coatsburg 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 | -7.9 °C | 1.3 °C | 46.48 mm |
| February | -5.9 °C | 4 °C | 50.04 mm |
| March | -0.5 °C | 10.5 °C | 64.77 mm |
| April | 5.6 °C | 17.3 °C | 102.36 mm |
| May | 11.8 °C | 22.8 °C | 127.76 mm |
| June | 17.1 °C | 27.9 °C | 119.63 mm |
| July | 18.9 °C | 30 °C | 100.58 mm |
| August | 17.7 °C | 29.1 °C | 96.52 mm |
| September | 12.9 °C | 25.7 °C | 86.87 mm |
| October | 6.6 °C | 18.7 °C | 81.79 mm |
| November | 0.4 °C | 10.8 °C | 67.82 mm |
| December | -4.9 °C | 3.9 °C | 51.82 mm |
| Annual | 6 °C | 16.8 °C | 996.44 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |