Brimson, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.3 °F (low) to 63 °F (high). Annual precipitation averages 39.7 Inches. Brimson 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 | 16.6 °F | 34.8 °F | 1.09 in. |
| February | 20.5 °F | 40.0 °F | 1.5 in. |
| March | 30.8 °F | 52.2 °F | 2.35 in. |
| April | 41.4 °F | 63.5 °F | 3.88 in. |
| May | 53.0 °F | 73.6 °F | 5.62 in. |
| June | 62.8 °F | 83.2 °F | 5.24 in. |
| July | 66.8 °F | 87.3 °F | 4.77 in. |
| August | 64.2 °F | 85.8 °F | 4.3 in. |
| September | 55.3 °F | 78.6 °F | 4.01 in. |
| October | 43.1 °F | 66.1 °F | 3.16 in. |
| November | 31.8 °F | 51.9 °F | 2.12 in. |
| December | 21.7 °F | 39.5 °F | 1.61 in. |
| Annual | 42.3 °F | 63 °F | 39.65 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 6a : -10°F to -5°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 |