nomadseason

December Weather in Lancaster, United States

Last updated: June 24, 2025

In December, the average temperature in Lancaster, United States hovers around 7°C (45°F), with extremes that can dip as low as -7°C (19°F) or climb to a pleasant 21°C (70°F). Expect 96 mm (3.8 in) of precipitation over about 10 days, contributing to an average humidity of 84%. Prepare accordingly for a typically damp and cool month!

December Temperature in Lancaster

In December in Lancaster, the average temperature is 7°C (45°F). Maximums can reach 21°C (70°F), while minimums can drop as low as -7°C (19°F). Pack layers to ensure comfort during your travels, as the temperature can vary widely throughout the day.

December Weather in Lancaster: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Lancaster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lancaster, December typically has an average temperature of 7°C (45°F), with highs reaching up to 21°C (70°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec404449586876817974655145
Data source: Temperature data for Lancaster generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Lancaster

In Lancaster in December, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

December Precipitation Trends in Lancaster

The chart displays monthly precipitation patterns in Lancaster, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Lancaster, December typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7610592981001091331581171297997
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Lancaster

In Lancaster in December, humidity is 84%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm while exploring the sights.

December Average Humidity in Lancaster

This chart illustrates the average monthly humidity levels in Lancaster, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Lancaster is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%82%81%80%82%81%81%78%80%84%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Lancaster

In Lancaster in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Lancaster, you can check the information here.

Maximum UV Index Levels in Lancaster for December

The chart shows the monthly maximum UV Index (UVI) for Lancaster in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Lancaster typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
Data source: Lancaster December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Lancaster Compares to Other Months

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.

This table compares monthly weather conditions in Lancaster, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)76 mm (3.0 inches)84%moderate
February Weather7°C (44°F)105 mm (4.1 inches)83%moderate
March Weather9°C (49°F)92 mm (3.6 inches)82%high
April Weather15°C (59°F)97 mm (3.8 inches)81%very high
May Weather20°C (68°F)100 mm (3.9 inches)80%very high
June Weather24°C (76°F)109 mm (4.3 inches)82%very high
July Weather27°C (81°F)133 mm (5.2 inches)81%very high
August Weather26°C (79°F)158 mm (6.2 inches)81%very high
September Weather23°C (74°F)117 mm (4.6 inches)78%very high
October Weather18°C (65°F)129 mm (5.1 inches)80%high
November Weather11°C (51°F)79 mm (3.1 inches)84%moderate
December Weather7°C (45°F)96 mm (3.8 inches)84%moderate

Compare Lancaster's Climate with Cities Worldwide