Baileyville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.8 °F (low) to 57.4 °F (high). Annual precipitation averages 38.3 Inches. Baileyville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.8 °F | 28.0 °F | 1.61 in. |
| February | 15.3 °F | 32.3 °F | 1.74 in. |
| March | 25.7 °F | 44.7 °F | 2.17 in. |
| April | 36.3 °F | 58.2 °F | 3.69 in. |
| May | 48.1 °F | 69.6 °F | 4.58 in. |
| June | 58.2 °F | 78.9 °F | 5.15 in. |
| July | 61.5 °F | 81.7 °F | 4.59 in. |
| August | 59.5 °F | 80.4 °F | 3.85 in. |
| September | 51.0 °F | 74.0 °F | 3.86 in. |
| October | 39.8 °F | 61.3 °F | 2.79 in. |
| November | 28.7 °F | 46.2 °F | 2.28 in. |
| December | 18.2 °F | 33.4 °F | 1.95 in. |
| Annual | 37.8 °F | 57.4 °F | 38.26 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |