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December Weather in Lancaster, United States

Last updated: June 24, 2025

In December, the average temperature in Lancaster, United States hovers around 3°C (37°F), with a minimum that can plummet to -17°C (2°F) and a maximum soaring to 18°C (65°F). Expect 111 mm (4.4 in) of precipitation spread over 11 days, contributing to a notably high average humidity of 87%.

December Temperature in Lancaster

In December in Lancaster, the average temperature is around 3°C (37°F). The maximum can reach 18°C (65°F), while the minimum can drop to as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures, so layering clothing is essential for comfort during their visit.

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 3°C (37°F), with highs reaching up to 18°C (65°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec323543526472767369584237
Data source: Temperature data for Lancaster generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Lancaster

In Lancaster in December, the precipitation amount is 111 mm (4.4 in), occurring over the course of 11 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 111 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec911231221341351591289696108103111
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lancaster

In Lancaster in December, humidity is 87%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating proper layers to stay warm while navigating the wet conditions.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
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 Weather0°C (32°F)90 mm (3.6 inches)88%moderate
February Weather2°C (36°F)123 mm (4.8 inches)88%moderate
March Weather6°C (43°F)122 mm (4.8 inches)87%high
April Weather11°C (53°F)134 mm (5.3 inches)85%very high
May Weather18°C (64°F)135 mm (5.3 inches)81%very high
June Weather22°C (72°F)159 mm (6.3 inches)82%very high
July Weather24°C (76°F)128 mm (5.0 inches)81%very high
August Weather23°C (74°F)96 mm (3.8 inches)73%very high
September Weather20°C (69°F)96 mm (3.8 inches)73%very high
October Weather14°C (58°F)108 mm (4.3 inches)78%high
November Weather6°C (43°F)103 mm (4.1 inches)89%moderate
December Weather3°C (37°F)111 mm (4.4 inches)87%moderate

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