Lancaster, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.2 °C (high). Annual precipitation averages 1009.4 Millimeters. Lancaster is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 0.3 °C | 30.99 mm |
| February | -7.6 °C | 2.9 °C | 37.59 mm |
| March | -1.7 °C | 10 °C | 56.9 mm |
| April | 4.4 °C | 16.8 °C | 97.28 mm |
| May | 10.8 °C | 22.2 °C | 144.27 mm |
| June | 16.3 °C | 27.5 °C | 133.86 mm |
| July | 18.4 °C | 29.7 °C | 119.63 mm |
| August | 17.2 °C | 28.9 °C | 114.55 mm |
| September | 12.3 °C | 25.1 °C | 100.58 mm |
| October | 5.7 °C | 18.1 °C | 74.93 mm |
| November | -0.9 °C | 10 °C | 58.17 mm |
| December | -6.3 °C | 3.1 °C | 40.64 mm |
| Annual | 4.9 °C | 16.2 °C | 1009.39 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |