Beaver Bay, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.5 °F (low) to 48.8 °F (high). Annual precipitation averages 30.2 Inches. 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 | 4.9 °F | 22.3 °F | 1.29 in. |
| February | 6.6 °F | 26.5 °F | 1.12 in. |
| March | 17.4 °F | 35.7 °F | 1.54 in. |
| April | 29.4 °F | 45.9 °F | 2.56 in. |
| May | 38.7 °F | 57.5 °F | 3.37 in. |
| June | 46.9 °F | 66.8 °F | 3.86 in. |
| July | 54.9 °F | 74.2 °F | 3.08 in. |
| August | 55.0 °F | 73.2 °F | 3.05 in. |
| September | 48.4 °F | 65.4 °F | 3.4 in. |
| October | 37.3 °F | 52.3 °F | 3.16 in. |
| November | 25.3 °F | 39.0 °F | 2.01 in. |
| December | 12.7 °F | 27.1 °F | 1.77 in. |
| Annual | 31.5 °F | 48.8 °F | 30.21 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |