International Falls, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.6 °C (low) to 9.3 °C (high). Annual precipitation averages 696.2 Millimeters. International Falls 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.9 °C | -9.4 °C | 29.21 mm |
| February | -19.2 °C | -6 °C | 23.11 mm |
| March | -11.3 °C | 1.5 °C | 27.18 mm |
| April | -2.7 °C | 9.7 °C | 43.69 mm |
| May | 4.2 °C | 17.5 °C | 77.47 mm |
| June | 10.1 °C | 22.8 °C | 100.84 mm |
| July | 12.5 °C | 25.4 °C | 99.82 mm |
| August | 11.4 °C | 24.5 °C | 77.22 mm |
| September | 6.8 °C | 19.4 °C | 80.52 mm |
| October | 0.6 °C | 10.7 °C | 60.71 mm |
| November | -7 °C | 1.3 °C | 41.91 mm |
| December | -15.6 °C | -6.1 °C | 34.54 mm |
| Annual | -2.6 °C | 9.3 °C | 696.22 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| 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 3a : -40°C to -37.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |