Warrensburg, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42 °F (low) to 62.8 °F (high). Annual precipitation averages 39.3 Inches. Warrensburg is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.3 °F | 34.7 °F | 2.26 in. |
| February | 20.9 °F | 39.6 °F | 2.02 in. |
| March | 30.2 °F | 50.8 °F | 2.74 in. |
| April | 41.3 °F | 64.5 °F | 4.1 in. |
| May | 53.0 °F | 74.0 °F | 4.54 in. |
| June | 61.4 °F | 83.5 °F | 4.6 in. |
| July | 64.5 °F | 86.2 °F | 3.91 in. |
| August | 62.7 °F | 84.0 °F | 3.3 in. |
| September | 54.2 °F | 79.1 °F | 3.13 in. |
| October | 42.4 °F | 66.5 °F | 3.3 in. |
| November | 31.8 °F | 51.6 °F | 3.04 in. |
| December | 23.8 °F | 39.5 °F | 2.37 in. |
| Annual | 42 °F | 62.8 °F | 39.31 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |