Annandale, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.3 °F (low) to 53.4 °F (high). Annual precipitation averages 30 Inches. Annandale is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.1 °F | 21.4 °F | 0.73 in. |
| February | 7.2 °F | 26.1 °F | 0.85 in. |
| March | 20.0 °F | 38.8 °F | 1.43 in. |
| April | 33.4 °F | 54.2 °F | 2.68 in. |
| May | 46.5 °F | 67.4 °F | 3.95 in. |
| June | 57.1 °F | 77.0 °F | 4.3 in. |
| July | 61.3 °F | 81.2 °F | 3.9 in. |
| August | 58.4 °F | 79.0 °F | 4.09 in. |
| September | 50.1 °F | 71.7 °F | 3.15 in. |
| October | 37.3 °F | 56.9 °F | 2.51 in. |
| November | 24.3 °F | 40.5 °F | 1.4 in. |
| December | 11.4 °F | 26.7 °F | 1.01 in. |
| Annual | 34.3 °F | 53.4 °F | 30 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |