Lancaster, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.3 °F (low) to 55.6 °F (high). Annual precipitation averages 38.1 Inches. 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 | 9.9 °F | 25.7 °F | 1.21 in. |
| February | 13.3 °F | 30.2 °F | 1.27 in. |
| March | 24.9 °F | 42.9 °F | 1.95 in. |
| April | 36.2 °F | 56.4 °F | 3.81 in. |
| May | 47.9 °F | 68.1 °F | 4.4 in. |
| June | 58.1 °F | 77.4 °F | 5.8 in. |
| July | 61.9 °F | 80.8 °F | 4.91 in. |
| August | 59.9 °F | 79.0 °F | 3.92 in. |
| September | 51.5 °F | 72.2 °F | 4.01 in. |
| October | 39.6 °F | 59.1 °F | 2.9 in. |
| November | 27.9 °F | 44.4 °F | 2.25 in. |
| December | 16.8 °F | 31.5 °F | 1.63 in. |
| Annual | 37.3 °F | 55.6 °F | 38.06 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |