Hopewell, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 61.1 °F (high). Annual precipitation averages 38.2 Inches. Hopewell 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 | 15.6 °F | 31.9 °F | 2.06 in. |
| February | 19.0 °F | 36.3 °F | 1.9 in. |
| March | 28.9 °F | 48.8 °F | 2.55 in. |
| April | 39.4 °F | 62.3 °F | 3.88 in. |
| May | 50.9 °F | 73.1 °F | 4.97 in. |
| June | 60.6 °F | 82.0 °F | 4.15 in. |
| July | 64.1 °F | 85.1 °F | 3.71 in. |
| August | 62.0 °F | 83.7 °F | 3.68 in. |
| September | 53.7 °F | 77.9 °F | 3.45 in. |
| October | 42.1 °F | 65.2 °F | 3.16 in. |
| November | 31.1 °F | 50.0 °F | 2.67 in. |
| December | 21.4 °F | 37.2 °F | 2.06 in. |
| Annual | 40.7 °F | 61.1 °F | 38.24 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 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 |