Brookfield, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.6 °F (low) to 63.4 °F (high). Annual precipitation averages 40.7 Inches. Brookfield 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.0 °F | 35.5 °F | 1.35 in. |
| February | 21.0 °F | 40.9 °F | 1.75 in. |
| March | 31.1 °F | 52.8 °F | 2.7 in. |
| April | 41.8 °F | 64.2 °F | 3.97 in. |
| May | 53.0 °F | 73.7 °F | 5.28 in. |
| June | 62.9 °F | 82.7 °F | 5.51 in. |
| July | 66.8 °F | 86.8 °F | 4.82 in. |
| August | 64.3 °F | 85.7 °F | 3.87 in. |
| September | 55.2 °F | 78.8 °F | 4.21 in. |
| October | 43.5 °F | 66.8 °F | 3.26 in. |
| November | 32.1 °F | 52.6 °F | 2.36 in. |
| December | 22.0 °F | 40.0 °F | 1.65 in. |
| Annual | 42.6 °F | 63.4 °F | 40.73 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |