Granite Falls, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 33.7 °F (low) to 55.4 °F (high). Annual precipitation averages 27.3 Inches. 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 | 3.4 °F | 22.7 °F | 0.7 in. |
| February | 7.5 °F | 27.2 °F | 0.78 in. |
| March | 20.4 °F | 39.8 °F | 1.47 in. |
| April | 33.4 °F | 56.2 °F | 2.47 in. |
| May | 45.8 °F | 69.5 °F | 3.41 in. |
| June | 56.8 °F | 79.4 °F | 4.61 in. |
| July | 60.4 °F | 83.5 °F | 3.29 in. |
| August | 57.7 °F | 81.0 °F | 3.55 in. |
| September | 49.2 °F | 74.5 °F | 2.79 in. |
| October | 35.9 °F | 60.0 °F | 2.16 in. |
| November | 23.3 °F | 42.4 °F | 1.25 in. |
| December | 11.0 °F | 28.0 °F | 0.85 in. |
| Annual | 33.7 °F | 55.4 °F | 27.33 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |