Alden, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.6 °F (low) to 54.7 °F (high). Annual precipitation averages 34.9 Inches. Alden is located in USDA Plant Hardiness Zone 5a. 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 | 23.0 °F | 0.85 in. |
| February | 10.0 °F | 27.4 °F | 0.92 in. |
| March | 22.6 °F | 39.8 °F | 1.84 in. |
| April | 34.8 °F | 55.5 °F | 3.48 in. |
| May | 47.3 °F | 68.0 °F | 4.73 in. |
| June | 58.4 °F | 78.1 °F | 5.44 in. |
| July | 61.8 °F | 81.4 °F | 4.67 in. |
| August | 59.1 °F | 79.0 °F | 4.17 in. |
| September | 50.4 °F | 73.0 °F | 3.69 in. |
| October | 37.5 °F | 59.1 °F | 2.43 in. |
| November | 25.5 °F | 42.9 °F | 1.51 in. |
| December | 13.3 °F | 28.7 °F | 1.21 in. |
| Annual | 35.6 °F | 54.7 °F | 34.94 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 5a : -20°F to -15°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 |