Granite Falls, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1 °C (low) to 13 °C (high). Annual precipitation averages 694.2 Millimeters. Granite Falls is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.9 °C | -5.2 °C | 17.78 mm |
| February | -13.6 °C | -2.7 °C | 19.81 mm |
| March | -6.4 °C | 4.3 °C | 37.34 mm |
| April | 0.8 °C | 13.4 °C | 62.74 mm |
| May | 7.7 °C | 20.8 °C | 86.61 mm |
| June | 13.8 °C | 26.3 °C | 117.09 mm |
| July | 15.8 °C | 28.6 °C | 83.57 mm |
| August | 14.3 °C | 27.2 °C | 90.17 mm |
| September | 9.6 °C | 23.6 °C | 70.87 mm |
| October | 2.2 °C | 15.6 °C | 54.86 mm |
| November | -4.8 °C | 5.8 °C | 31.75 mm |
| December | -11.7 °C | -2.2 °C | 21.59 mm |
| Annual | 1 °C | 13 °C | 694.18 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |