Cobden, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 19.4 °C (high). Annual precipitation averages 1287.8 Millimeters. Cobden is located in USDA Plant Hardiness Zone 7a. 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 | -4.2 °C | 5.4 °C | 92.71 mm |
| February | -2.5 °C | 8.3 °C | 82.04 mm |
| March | 2.3 °C | 13.7 °C | 119.38 mm |
| April | 7.8 °C | 19.9 °C | 138.94 mm |
| May | 13.3 °C | 24.6 °C | 145.8 mm |
| June | 17.9 °C | 29.4 °C | 123.19 mm |
| July | 20.1 °C | 30.7 °C | 101.85 mm |
| August | 18.8 °C | 30.5 °C | 81.28 mm |
| September | 14.4 °C | 27.3 °C | 88.39 mm |
| October | 8.1 °C | 21.3 °C | 95.5 mm |
| November | 2.6 °C | 13.7 °C | 117.6 mm |
| December | -2.2 °C | 7.4 °C | 101.09 mm |
| Annual | 8 °C | 19.4 °C | 1287.77 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |