Aviston, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46 °F (low) to 65.8 °F (high). Annual precipitation averages 42 Inches. Aviston 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.5 °F | 39.3 °F | 2.71 in. |
| February | 25.9 °F | 44.5 °F | 2.28 in. |
| March | 34.7 °F | 54.8 °F | 3.23 in. |
| April | 45.3 °F | 66.8 °F | 4.69 in. |
| May | 56.2 °F | 75.9 °F | 4.81 in. |
| June | 65.0 °F | 84.8 °F | 4.69 in. |
| July | 68.5 °F | 88.1 °F | 3.87 in. |
| August | 66.4 °F | 87.1 °F | 3.13 in. |
| September | 58.0 °F | 80.6 °F | 3.2 in. |
| October | 46.3 °F | 69.0 °F | 3.05 in. |
| November | 35.6 °F | 54.8 °F | 3.64 in. |
| December | 27.0 °F | 43.7 °F | 2.72 in. |
| Annual | 46 °F | 65.8 °F | 42.02 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |