Last updated: June 24, 2025
In Lancaster, United States, the average temperature for December hovers around -1°C (30°F), with a chilly minimum of -22°C (-7°F) and a rare maximum reaching 20°C (68°F). Expect about 41 mm (1.6 in) of precipitation spread over 6 days, contributing to an average humidity of 82% that envelops the area in a damp atmosphere.
In December in Lancaster, the average temperature is -1°C (30°F), with maximums reaching 20°C (68°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures, so layered clothing is essential for comfort during this time.
In Lancaster in December, the precipitation amount is 41 mm (1.6 in) over the course of 6 days.
In Lancaster in December, humidity is 82%. With an average temperature of -1°C (30°F), this humidity feels like a sharp chill that penetrates your clothing, making travel uncomfortable and dampening your spirit as you navigate through the cold, moisture-laden air.
In Lancaster in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Lancaster, you can visit Hourly UV Index in Lancaster.
UV Risk Categories
Weather in Lancaster varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lancaster, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 46 mm (1.8 inches) | 84% | moderate |
| February Weather | -5°C (23°F) | 59 mm (2.3 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 61 mm (2.4 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 85 mm (3.4 inches) | 83% | very high |
| May Weather | 16°C (61°F) | 143 mm (5.6 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 135 mm (5.3 inches) | 79% | very high |
| July Weather | 24°C (76°F) | 103 mm (4.0 inches) | 75% | very high |
| August Weather | 22°C (72°F) | 87 mm (3.4 inches) | 69% | very high |
| September Weather | 19°C (66°F) | 116 mm (4.6 inches) | 74% | very high |
| October Weather | 11°C (52°F) | 124 mm (4.9 inches) | 79% | moderate |
| November Weather | 3°C (37°F) | 47 mm (1.8 inches) | 88% | moderate |
| December Weather | -1°C (30°F) | 41 mm (1.6 inches) | 82% | low |