Annandale, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.3 °C (low) to 11.9 °C (high). Annual precipitation averages 762 Millimeters. 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 | -15.5 °C | -5.9 °C | 18.54 mm |
| February | -13.8 °C | -3.3 °C | 21.59 mm |
| March | -6.7 °C | 3.8 °C | 36.32 mm |
| April | 0.8 °C | 12.3 °C | 68.07 mm |
| May | 8.1 °C | 19.7 °C | 100.33 mm |
| June | 13.9 °C | 25 °C | 109.22 mm |
| July | 16.3 °C | 27.3 °C | 99.06 mm |
| August | 14.7 °C | 26.1 °C | 103.89 mm |
| September | 10.1 °C | 22.1 °C | 80.01 mm |
| October | 2.9 °C | 13.8 °C | 63.75 mm |
| November | -4.3 °C | 4.7 °C | 35.56 mm |
| December | -11.4 °C | -2.9 °C | 25.65 mm |
| Annual | 1.3 °C | 11.9 °C | 761.99 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |