Bishop Hill, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 59.8 °F (high). Annual precipitation averages 38.7 Inches. Bishop Hill is located in USDA Plant Hardiness Zone 5b. 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 | 13.7 °F | 30.1 °F | 1.71 in. |
| February | 17.1 °F | 34.7 °F | 1.92 in. |
| March | 27.5 °F | 47.9 °F | 2.42 in. |
| April | 38.3 °F | 61.1 °F | 3.94 in. |
| May | 50.5 °F | 72.2 °F | 4.98 in. |
| June | 60.4 °F | 80.9 °F | 4.76 in. |
| July | 63.6 °F | 83.8 °F | 4.02 in. |
| August | 61.4 °F | 82.3 °F | 3.72 in. |
| September | 53.0 °F | 76.5 °F | 3.81 in. |
| October | 41.5 °F | 63.8 °F | 2.85 in. |
| November | 29.8 °F | 48.5 °F | 2.49 in. |
| December | 19.6 °F | 35.7 °F | 2.09 in. |
| Annual | 39.7 °F | 59.8 °F | 38.71 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |