Keensburg, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.7 °F (low) to 66.5 °F (high). Annual precipitation averages 47 Inches. Keensburg 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.6 °F | 40.0 °F | 3.54 in. |
| February | 26.4 °F | 45.1 °F | 2.87 in. |
| March | 34.6 °F | 55.1 °F | 4.13 in. |
| April | 45.0 °F | 67.4 °F | 5.04 in. |
| May | 55.8 °F | 77.0 °F | 5.16 in. |
| June | 64.4 °F | 85.4 °F | 4.6 in. |
| July | 67.3 °F | 88.3 °F | 4.26 in. |
| August | 65.2 °F | 87.4 °F | 3.18 in. |
| September | 57.4 °F | 81.9 °F | 3.39 in. |
| October | 45.8 °F | 70.1 °F | 3.43 in. |
| November | 35.4 °F | 55.6 °F | 3.89 in. |
| December | 27.4 °F | 44.3 °F | 3.54 in. |
| Annual | 45.7 °F | 66.5 °F | 47.03 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |