Brainerd, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 10.9 °C (high). Annual precipitation averages 730.5 Millimeters. Brainerd is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.9 °C | -7.1 °C | 17.78 mm |
| February | -16.2 °C | -4 °C | 18.8 mm |
| March | -8.7 °C | 3.2 °C | 34.29 mm |
| April | -1 °C | 11.2 °C | 58.93 mm |
| May | 6.4 °C | 18.7 °C | 90.17 mm |
| June | 12.3 °C | 24 °C | 112.78 mm |
| July | 14.7 °C | 26.7 °C | 110.74 mm |
| August | 13.2 °C | 25.4 °C | 87.63 mm |
| September | 8.4 °C | 20.7 °C | 74.17 mm |
| October | 1.7 °C | 12.5 °C | 68.83 mm |
| November | -5.6 °C | 3.4 °C | 33.02 mm |
| December | -12.9 °C | -4 °C | 23.37 mm |
| Annual | -0.5 °C | 10.9 °C | 730.51 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |