Buffalo, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 12.1 °C (high). Annual precipitation averages 793 Millimeters. Buffalo is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.1 °C | -5.6 °C | 19.05 mm |
| February | -13.3 °C | -2.9 °C | 21.34 mm |
| March | -6.3 °C | 4.1 °C | 37.85 mm |
| April | 1.2 °C | 12.5 °C | 72.14 mm |
| May | 8.3 °C | 19.7 °C | 104.14 mm |
| June | 14.3 °C | 25.1 °C | 118.36 mm |
| July | 16.7 °C | 27.6 °C | 98.04 mm |
| August | 15.2 °C | 26.2 °C | 107.7 mm |
| September | 10.5 °C | 22.1 °C | 83.06 mm |
| October | 3.3 °C | 13.9 °C | 66.04 mm |
| November | -3.8 °C | 5.1 °C | 37.08 mm |
| December | -11 °C | -2.7 °C | 28.19 mm |
| Annual | 1.7 °C | 12.1 °C | 792.99 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |