Elsah, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8 °C (low) to 18.6 °C (high). Annual precipitation averages 1053.4 Millimeters. Elsah 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 | -5.3 °C | 3.8 °C | 62.74 mm |
| February | -3.4 °C | 6.8 °C | 56.9 mm |
| March | 1.5 °C | 12.6 °C | 82.55 mm |
| April | 7.6 °C | 19.2 °C | 118.87 mm |
| May | 13.6 °C | 24.3 °C | 122.43 mm |
| June | 18.7 °C | 29.1 °C | 107.7 mm |
| July | 20.6 °C | 30.9 °C | 96.01 mm |
| August | 19.5 °C | 30.4 °C | 92.46 mm |
| September | 14.8 °C | 26.8 °C | 83.06 mm |
| October | 8.3 °C | 20.3 °C | 78.74 mm |
| November | 2.2 °C | 12.6 °C | 85.6 mm |
| December | -2.7 °C | 6.4 °C | 66.29 mm |
| Annual | 8 °C | 18.6 °C | 1053.35 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |