Lonsdale, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.6 °C (low) to 12.3 °C (high). Annual precipitation averages 845.1 Millimeters. Lonsdale 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 | -14.7 °C | -5.2 °C | 20.83 mm |
| February | -12.8 °C | -2.7 °C | 22.61 mm |
| March | -6 °C | 4.3 °C | 43.69 mm |
| April | 1.2 °C | 12.8 °C | 72.64 mm |
| May | 8.3 °C | 19.8 °C | 111 mm |
| June | 14.3 °C | 25.2 °C | 128.52 mm |
| July | 16 °C | 27.3 °C | 106.93 mm |
| August | 14.7 °C | 26.2 °C | 117.35 mm |
| September | 9.9 °C | 22.3 °C | 84.33 mm |
| October | 2.7 °C | 14.4 °C | 64.77 mm |
| November | -3.9 °C | 5.4 °C | 40.64 mm |
| December | -10.8 °C | -2.2 °C | 31.75 mm |
| Annual | 1.6 °C | 12.3 °C | 845.06 mm |
| 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 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 |