Dundas, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.2 °F (low) to 54.8 °F (high). Annual precipitation averages 33.8 Inches. Dundas 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 | 5.7 °F | 23.3 °F | 0.88 in. |
| February | 9.2 °F | 28.0 °F | 0.96 in. |
| March | 21.6 °F | 40.4 °F | 1.78 in. |
| April | 34.5 °F | 55.7 °F | 2.9 in. |
| May | 47.1 °F | 68.2 °F | 4.47 in. |
| June | 57.8 °F | 78.0 °F | 5.17 in. |
| July | 61.5 °F | 81.8 °F | 4.18 in. |
| August | 59.0 °F | 79.8 °F | 4.67 in. |
| September | 50.6 °F | 72.8 °F | 3.43 in. |
| October | 37.6 °F | 58.7 °F | 2.5 in. |
| November | 25.2 °F | 42.1 °F | 1.64 in. |
| December | 12.8 °F | 28.7 °F | 1.21 in. |
| Annual | 35.2 °F | 54.8 °F | 33.79 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 |