Energy, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 19.2 °C (high). Annual precipitation averages 1212.9 Millimeters. Energy is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.4 °C | 5 °C | 87.12 mm |
| February | -2.7 °C | 7.8 °C | 78.23 mm |
| March | 1.9 °C | 13.3 °C | 110.74 mm |
| April | 7.6 °C | 19.7 °C | 136.65 mm |
| May | 13.3 °C | 24.6 °C | 132.84 mm |
| June | 18 °C | 29.3 °C | 116.08 mm |
| July | 20 °C | 30.9 °C | 99.82 mm |
| August | 18.6 °C | 30.6 °C | 78.74 mm |
| September | 14.1 °C | 27.3 °C | 82.3 mm |
| October | 7.7 °C | 21 °C | 90.68 mm |
| November | 2.2 °C | 13.5 °C | 108.46 mm |
| December | -2.3 °C | 7.3 °C | 91.19 mm |
| Annual | 7.8 °C | 19.2 °C | 1212.85 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |