Elvaston, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 16.8 °C (high). Annual precipitation averages 1017.5 Millimeters. Elvaston is located in USDA Plant Hardiness Zone 6a. 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 | -8.4 °C | 0.9 °C | 43.94 mm |
| February | -6.4 °C | 3.5 °C | 48.77 mm |
| March | -0.8 °C | 10.3 °C | 64.52 mm |
| April | 5.2 °C | 17.3 °C | 102.62 mm |
| May | 11.7 °C | 23 °C | 135.64 mm |
| June | 17.1 °C | 28.1 °C | 126.24 mm |
| July | 19.1 °C | 30.2 °C | 105.66 mm |
| August | 17.8 °C | 29.3 °C | 97.79 mm |
| September | 13.2 °C | 25.8 °C | 93.47 mm |
| October | 6.6 °C | 18.7 °C | 82.04 mm |
| November | 0.2 °C | 10.6 °C | 67.06 mm |
| December | -5.2 °C | 3.6 °C | 49.78 mm |
| Annual | 5.8 °C | 16.8 °C | 1017.53 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |