Big Falls, Minnesota has a Humid Continental Mild Summer With Dry Winters climate (Köppen classification: Dwb). Average annual temperatures range from 27.3 °F (low) to 49.9 °F (high). Annual precipitation averages 26.9 Inches. Big 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 | -5.1 °F | 16.6 °F | 0.84 in. |
| February | -1.9 °F | 22.8 °F | 0.76 in. |
| March | 12.2 °F | 36.5 °F | 1.13 in. |
| April | 26.9 °F | 51.3 °F | 1.81 in. |
| May | 39.6 °F | 64.8 °F | 3.21 in. |
| June | 49.9 °F | 74.0 °F | 4.01 in. |
| July | 53.9 °F | 78.4 °F | 3.88 in. |
| August | 51.8 °F | 76.9 °F | 3.35 in. |
| September | 43.6 °F | 68.0 °F | 3.13 in. |
| October | 32.5 °F | 52.6 °F | 2.31 in. |
| November | 19.1 °F | 35.1 °F | 1.43 in. |
| December | 4.5 °F | 22.0 °F | 1.01 in. |
| Annual | 27.3 °F | 49.9 °F | 26.87 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dwb - Humid Continental Mild Summer With Dry Winters |