Backus, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 10.2 °C (high). Annual precipitation averages 684.8 Millimeters. Backus is located in USDA Plant Hardiness Zone 4a. 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 | -18.3 °C | -7.8 °C | 15.49 mm |
| February | -16.8 °C | -4.6 °C | 17.78 mm |
| March | -9.2 °C | 2.6 °C | 32.51 mm |
| April | -1.3 °C | 10.8 °C | 55.63 mm |
| May | 6 °C | 18.2 °C | 84.84 mm |
| June | 11.8 °C | 23.2 °C | 103.38 mm |
| July | 14.4 °C | 25.8 °C | 101.35 mm |
| August | 13 °C | 24.8 °C | 79.25 mm |
| September | 8.3 °C | 20.1 °C | 75.95 mm |
| October | 1.4 °C | 11.7 °C | 68.33 mm |
| November | -5.8 °C | 2.8 °C | 27.18 mm |
| December | -13.5 °C | -4.8 °C | 23.11 mm |
| Annual | -0.8 °C | 10.2 °C | 684.8 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |