Deephaven, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.5 °F (low) to 54.5 °F (high). Annual precipitation averages 32 Inches. Deephaven 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 | 22.6 °F | 0.89 in. |
| February | 9.4 °F | 27.3 °F | 0.9 in. |
| March | 21.9 °F | 40.0 °F | 1.59 in. |
| April | 35.6 °F | 55.1 °F | 2.8 in. |
| May | 48.5 °F | 68.1 °F | 4.2 in. |
| June | 59.1 °F | 77.8 °F | 4.63 in. |
| July | 63.4 °F | 82.4 °F | 4.14 in. |
| August | 61.3 °F | 80.1 °F | 4.33 in. |
| September | 53.0 °F | 72.6 °F | 3.33 in. |
| October | 39.7 °F | 57.8 °F | 2.45 in. |
| November | 26.7 °F | 41.9 °F | 1.47 in. |
| December | 13.3 °F | 27.8 °F | 1.3 in. |
| Annual | 36.5 °F | 54.5 °F | 32.03 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |