Beaver Bay, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 9.4 °C (high). Annual precipitation averages 767.3 Millimeters. Beaver Bay is located in USDA Plant Hardiness Zone 4b. 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 | -15.1 °C | -5.4 °C | 32.77 mm |
| February | -14.1 °C | -3.1 °C | 28.45 mm |
| March | -8.1 °C | 2.1 °C | 39.12 mm |
| April | -1.4 °C | 7.7 °C | 65.02 mm |
| May | 3.7 °C | 14.2 °C | 85.6 mm |
| June | 8.3 °C | 19.3 °C | 98.04 mm |
| July | 12.7 °C | 23.4 °C | 78.23 mm |
| August | 12.8 °C | 22.9 °C | 77.47 mm |
| September | 9.1 °C | 18.6 °C | 86.36 mm |
| October | 2.9 °C | 11.3 °C | 80.26 mm |
| November | -3.7 °C | 3.9 °C | 51.05 mm |
| December | -10.7 °C | -2.7 °C | 44.96 mm |
| Annual | -0.3 °C | 9.4 °C | 767.33 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |