Cannon Falls, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.6 °F (low) to 54.9 °F (high). Annual precipitation averages 34.4 Inches. Cannon 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 | 6.2 °F | 23.4 °F | 0.93 in. |
| February | 9.5 °F | 28.3 °F | 0.96 in. |
| March | 22.0 °F | 40.5 °F | 1.74 in. |
| April | 34.9 °F | 55.8 °F | 2.92 in. |
| May | 47.4 °F | 68.2 °F | 4.39 in. |
| June | 57.9 °F | 77.8 °F | 5.33 in. |
| July | 61.8 °F | 81.8 °F | 4.21 in. |
| August | 59.2 °F | 79.9 °F | 4.69 in. |
| September | 50.9 °F | 72.7 °F | 3.71 in. |
| October | 38.1 °F | 58.6 °F | 2.64 in. |
| November | 25.9 °F | 42.4 °F | 1.6 in. |
| December | 13.6 °F | 29.0 °F | 1.27 in. |
| Annual | 35.6 °F | 54.9 °F | 34.39 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 | Dfb - Humid Continental Mild Summer, Wet All Year |