Ham Lake, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 12.6 °C (high). Annual precipitation averages 832.4 Millimeters. Ham Lake 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 | -14.6 °C | -5 °C | 20.57 mm |
| February | -12.8 °C | -2.1 °C | 21.08 mm |
| March | -6.2 °C | 5 °C | 40.64 mm |
| April | 1.1 °C | 13.1 °C | 76.2 mm |
| May | 8.1 °C | 20.2 °C | 111.76 mm |
| June | 13.8 °C | 25.3 °C | 119.13 mm |
| July | 16.5 °C | 27.9 °C | 109.98 mm |
| August | 15.1 °C | 26.6 °C | 107.95 mm |
| September | 10.4 °C | 22.3 °C | 84.07 mm |
| October | 3.3 °C | 14.3 °C | 68.33 mm |
| November | -3.7 °C | 5.5 °C | 42.67 mm |
| December | -10.7 °C | -2.1 °C | 29.97 mm |
| Annual | 1.7 °C | 12.6 °C | 832.35 mm |
| 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 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 |