Emden, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 17 °C (high). Annual precipitation averages 981.7 Millimeters. Emden 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 1.1 °C | 55.12 mm |
| February | -6.3 °C | 3.8 °C | 49.02 mm |
| March | -1 °C | 10.4 °C | 65.79 mm |
| April | 4.9 °C | 17.8 °C | 97.03 mm |
| May | 11.4 °C | 23.6 °C | 115.06 mm |
| June | 16.7 °C | 28.4 °C | 113.28 mm |
| July | 18.3 °C | 29.9 °C | 104.39 mm |
| August | 17.1 °C | 29.1 °C | 89.92 mm |
| September | 12.5 °C | 26.3 °C | 83.82 mm |
| October | 6 °C | 19.3 °C | 80.01 mm |
| November | 0 °C | 10.8 °C | 71.37 mm |
| December | -5.1 °C | 4 °C | 56.9 mm |
| Annual | 5.5 °C | 17 °C | 981.71 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |