Elvaston, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.5 °F (low) to 62.2 °F (high). Annual precipitation averages 40.1 Inches. 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 | 16.9 °F | 33.6 °F | 1.73 in. |
| February | 20.4 °F | 38.3 °F | 1.92 in. |
| March | 30.6 °F | 50.6 °F | 2.54 in. |
| April | 41.4 °F | 63.2 °F | 4.04 in. |
| May | 53.0 °F | 73.4 °F | 5.34 in. |
| June | 62.7 °F | 82.6 °F | 4.97 in. |
| July | 66.4 °F | 86.3 °F | 4.16 in. |
| August | 64.1 °F | 84.7 °F | 3.85 in. |
| September | 55.7 °F | 78.4 °F | 3.68 in. |
| October | 43.9 °F | 65.7 °F | 3.23 in. |
| November | 32.4 °F | 51.0 °F | 2.64 in. |
| December | 22.6 °F | 38.5 °F | 1.96 in. |
| Annual | 42.5 °F | 62.2 °F | 40.06 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |