Broadlands, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 16.8 °C (high). Annual precipitation averages 1007.4 Millimeters. Broadlands is located in USDA Plant Hardiness Zone 6a. 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 | -7.8 °C | 1.1 °C | 60.96 mm |
| February | -6 °C | 3.7 °C | 51.82 mm |
| March | -0.8 °C | 10.2 °C | 70.87 mm |
| April | 5 °C | 17.4 °C | 111 mm |
| May | 11.4 °C | 23.4 °C | 113.03 mm |
| June | 16.6 °C | 28.1 °C | 115.32 mm |
| July | 18 °C | 29.3 °C | 103.89 mm |
| August | 16.7 °C | 28.5 °C | 69.34 mm |
| September | 12.6 °C | 25.9 °C | 80.26 mm |
| October | 6.1 °C | 18.9 °C | 83.31 mm |
| November | 0.2 °C | 10.7 °C | 84.58 mm |
| December | -4.6 °C | 3.8 °C | 62.99 mm |
| Annual | 5.6 °C | 16.8 °C | 1007.37 mm |
| 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |