Lancaster, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 28.4 °F (low) to 48.5 °F (high). Annual precipitation averages 23.6 Inches. Lancaster is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °F | 12.7 °F | 0.68 in. |
| February | -1.6 °F | 17.8 °F | 0.55 in. |
| March | 12.9 °F | 31.2 °F | 0.8 in. |
| April | 29.1 °F | 50.0 °F | 1.11 in. |
| May | 41.7 °F | 64.7 °F | 3.44 in. |
| June | 53.1 °F | 74.2 °F | 4.22 in. |
| July | 56.6 °F | 78.7 °F | 3.73 in. |
| August | 53.6 °F | 78.1 °F | 2.84 in. |
| September | 44.9 °F | 69.0 °F | 2.5 in. |
| October | 33.0 °F | 52.5 °F | 1.85 in. |
| November | 18.3 °F | 34.0 °F | 1.04 in. |
| December | 3.6 °F | 19.2 °F | 0.81 in. |
| Annual | 28.4 °F | 48.5 °F | 23.57 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |