Biwabik, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3 °C (low) to 9.4 °C (high). Annual precipitation averages 712.2 Millimeters. Biwabik is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.3 °C | -8.3 °C | 24.13 mm |
| February | -18.9 °C | -5.1 °C | 19.56 mm |
| March | -11.4 °C | 2.1 °C | 27.43 mm |
| April | -3.6 °C | 9.6 °C | 49.02 mm |
| May | 3.5 °C | 17.2 °C | 77.22 mm |
| June | 9.3 °C | 22.5 °C | 103.89 mm |
| July | 11.8 °C | 25.2 °C | 105.16 mm |
| August | 10.3 °C | 24.1 °C | 83.57 mm |
| September | 6.3 °C | 19.2 °C | 86.61 mm |
| October | -0.1 °C | 10.8 °C | 69.34 mm |
| November | -7.4 °C | 1.4 °C | 37.85 mm |
| December | -15.2 °C | -5.5 °C | 28.45 mm |
| Annual | -3 °C | 9.4 °C | 712.23 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| 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 |