Bruno, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.2 °C (low) to 10.9 °C (high). Annual precipitation averages 816.1 Millimeters. Bruno is located in USDA Plant Hardiness Zone 4a. 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 | -17.7 °C | -6.6 °C | 22.1 mm |
| February | -15.8 °C | -3.4 °C | 23.37 mm |
| March | -8.8 °C | 3.3 °C | 38.61 mm |
| April | -1.8 °C | 10.8 °C | 68.07 mm |
| May | 4.5 °C | 18.5 °C | 91.69 mm |
| June | 9.9 °C | 23.4 °C | 116.33 mm |
| July | 13.2 °C | 26.3 °C | 116.33 mm |
| August | 12.2 °C | 25.1 °C | 101.09 mm |
| September | 7.7 °C | 20.6 °C | 84.58 mm |
| October | 1.2 °C | 12.5 °C | 77.47 mm |
| November | -5.6 °C | 3.6 °C | 43.18 mm |
| December | -13.1 °C | -3.8 °C | 33.27 mm |
| Annual | -1.2 °C | 10.9 °C | 816.09 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 4a : -34.4°C to -31.7°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 |