Lake Bronson, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.1 °C (low) to 9.3 °C (high). Annual precipitation averages 608.8 Millimeters. Lake Bronson is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.5 °C | -10.6 °C | 16.76 mm |
| February | -18.8 °C | -7.8 °C | 13.97 mm |
| March | -10.7 °C | -0.2 °C | 20.32 mm |
| April | -1.7 °C | 10 °C | 29.72 mm |
| May | 5.3 °C | 18.2 °C | 84.58 mm |
| June | 11.7 °C | 23.6 °C | 108.71 mm |
| July | 13.6 °C | 26 °C | 90.68 mm |
| August | 11.9 °C | 25.7 °C | 76.45 mm |
| September | 7 °C | 20.7 °C | 66.55 mm |
| October | 0.5 °C | 11.4 °C | 49.28 mm |
| November | -7.7 °C | 1.2 °C | 28.96 mm |
| December | -15.8 °C | -7.1 °C | 22.86 mm |
| Annual | -2.1 °C | 9.3 °C | 608.84 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |