Braidwood, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 60.4 °F (high). Annual precipitation averages 38.2 Inches. Braidwood 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 | 15.9 °F | 31.6 °F | 2.13 in. |
| February | 18.9 °F | 35.8 °F | 1.89 in. |
| March | 28.4 °F | 47.8 °F | 2.37 in. |
| April | 38.9 °F | 60.9 °F | 3.68 in. |
| May | 50.1 °F | 72.0 °F | 4.73 in. |
| June | 60.1 °F | 81.3 °F | 4.55 in. |
| July | 63.6 °F | 84.5 °F | 4.06 in. |
| August | 61.9 °F | 82.7 °F | 3.82 in. |
| September | 53.9 °F | 77.4 °F | 3.33 in. |
| October | 42.1 °F | 64.2 °F | 3.06 in. |
| November | 31.5 °F | 49.3 °F | 2.47 in. |
| December | 21.7 °F | 36.9 °F | 2.09 in. |
| Annual | 40.6 °F | 60.4 °F | 38.18 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 |