Last updated: June 24, 2025
In December, the average temperature in Lancaster, United States is a brisk 1°C (34°F). Visitors can expect a range of temperatures, with a chilly minimum of -24°C (-11°F) and a surprisingly warm maximum of 23°C (73°F). The month typically sees around 36 mm (1.4 in) of precipitation spread across 5 days, coupled with an average humidity of 83%. Be prepared for a mix of conditions!
In December in Lancaster, the average temperature is 1°C (34°F). Maximums can reach 23°C (73°F), while minimums can dip as low as -24°C (-11°F). Be prepared for a wide range of weather conditions when traveling during this month.
In Lancaster in December, the precipitation amount is 36 mm (1.4 in) over the course of 5 days.
In Lancaster in December, humidity is 83%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making travel uncomfortable as the damp cold seeps into your bones, adding an extra layer of heaviness to the air that can leave you feeling sluggish and fatigued.
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 | -3°C (26°F) | 54 mm (2.1 inches) | 78% | moderate |
| February Weather | -2°C (29°F) | 53 mm (2.1 inches) | 80% | moderate |
| March Weather | 6°C (42°F) | 98 mm (3.9 inches) | 77% | high |
| April Weather | 10°C (51°F) | 84 mm (3.3 inches) | 77% | very high |
| May Weather | 18°C (64°F) | 152 mm (6.0 inches) | 77% | very high |
| June Weather | 24°C (75°F) | 120 mm (4.7 inches) | 81% | extreme |
| July Weather | 26°C (79°F) | 82 mm (3.2 inches) | 81% | extreme |
| August Weather | 24°C (75°F) | 75 mm (2.9 inches) | 77% | very high |
| September Weather | 21°C (70°F) | 116 mm (4.6 inches) | 73% | very high |
| October Weather | 12°C (55°F) | 126 mm (5.0 inches) | 75% | high |
| November Weather | 5°C (41°F) | 50 mm (2.0 inches) | 85% | moderate |
| December Weather | 1°C (34°F) | 36 mm (1.4 inches) | 83% | low |