Lancaster, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 13.1 °C (high). Annual precipitation averages 966.7 Millimeters. Lancaster 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.3 °C | -3.5 °C | 30.73 mm |
| February | -10.4 °C | -1 °C | 32.26 mm |
| March | -3.9 °C | 6.1 °C | 49.53 mm |
| April | 2.3 °C | 13.6 °C | 96.77 mm |
| May | 8.8 °C | 20.1 °C | 111.76 mm |
| June | 14.5 °C | 25.2 °C | 147.32 mm |
| July | 16.6 °C | 27.1 °C | 124.71 mm |
| August | 15.5 °C | 26.1 °C | 99.57 mm |
| September | 10.8 °C | 22.3 °C | 101.85 mm |
| October | 4.2 °C | 15.1 °C | 73.66 mm |
| November | -2.3 °C | 6.9 °C | 57.15 mm |
| December | -8.4 °C | -0.3 °C | 41.4 mm |
| Annual | 3 °C | 13.1 °C | 966.71 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |