Hebron, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.1 °F (low) to 57.6 °F (high). Annual precipitation averages 37.7 Inches. Hebron is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.3 °F | 29.0 °F | 1.77 in. |
| February | 16.0 °F | 32.9 °F | 1.83 in. |
| March | 25.4 °F | 44.6 °F | 2.19 in. |
| April | 35.8 °F | 57.3 °F | 3.76 in. |
| May | 47.6 °F | 69.0 °F | 4.43 in. |
| June | 57.0 °F | 78.6 °F | 5.04 in. |
| July | 61.3 °F | 82.3 °F | 3.76 in. |
| August | 59.5 °F | 80.8 °F | 3.9 in. |
| September | 51.8 °F | 74.3 °F | 3.59 in. |
| October | 40.4 °F | 61.1 °F | 2.99 in. |
| November | 29.7 °F | 46.7 °F | 2.41 in. |
| December | 19.2 °F | 34.0 °F | 2.01 in. |
| Annual | 38.1 °F | 57.6 °F | 37.68 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |