Bagley, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.8 °C (low) to 9.9 °C (high). Annual precipitation averages 646.4 Millimeters. Bagley is located in USDA Plant Hardiness Zone 3b. 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 | -19.8 °C | -8.2 °C | 19.05 mm |
| February | -18.3 °C | -5.2 °C | 16.51 mm |
| March | -10.3 °C | 2.2 °C | 26.42 mm |
| April | -2.3 °C | 10.3 °C | 38.61 mm |
| May | 5.1 °C | 18 °C | 78.23 mm |
| June | 11.2 °C | 23.1 °C | 111.51 mm |
| July | 13.7 °C | 25.9 °C | 94.23 mm |
| August | 12.2 °C | 24.9 °C | 75.69 mm |
| September | 7.5 °C | 19.9 °C | 73.66 mm |
| October | 0.9 °C | 11.3 °C | 61.98 mm |
| November | -6.9 °C | 1.8 °C | 28.7 mm |
| December | -14.7 °C | -5.3 °C | 21.84 mm |
| Annual | -1.8 °C | 9.9 °C | 646.43 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |