Browns, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.5 °F (low) to 66.5 °F (high). Annual precipitation averages 46.4 Inches. Browns is located in USDA Plant Hardiness Zone 6b. 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 | 23.3 °F | 39.9 °F | 3.43 in. |
| February | 26.4 °F | 45.1 °F | 2.83 in. |
| March | 34.5 °F | 54.9 °F | 3.98 in. |
| April | 44.9 °F | 67.4 °F | 5.34 in. |
| May | 55.7 °F | 77.1 °F | 4.76 in. |
| June | 64.3 °F | 85.6 °F | 4.8 in. |
| July | 67.2 °F | 88.5 °F | 4.0 in. |
| August | 64.8 °F | 87.5 °F | 3.27 in. |
| September | 57.0 °F | 82.0 °F | 3.2 in. |
| October | 45.4 °F | 70.2 °F | 3.49 in. |
| November | 35.3 °F | 55.6 °F | 3.9 in. |
| December | 27.5 °F | 44.3 °F | 3.4 in. |
| Annual | 45.5 °F | 66.5 °F | 46.4 in. |
| 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |