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December Weather in Lancaster, United States

Last updated: June 24, 2025

In December, the average temperature in Lancaster, United States is a cool 9°C (48°F), with temperatures varying from a low of -5°C (24°F) to a high of 22°C (73°F). During this time, expect approximately 42 mm (1.7 in) of precipitation over about 4 days, contributing to an average humidity level of 76%.

December Temperature in Lancaster

In December in Lancaster, the average temperature is 9°C (48°F). The maximum can reach 22°C (73°F) and the minimum can be as low as -5°C (24°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warmth and coolness.

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 9°C (48°F), with highs reaching up to 22°C (73°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec485054616676828175655648
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 42 mm (1.7 in) distributed over a span of 4 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 42 mm (1.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec413138178121231243
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 76%. With an average temperature of 9°C (48°F), this humidity feels like a chilly embrace, making outdoor activities feel damp and brisk, potentially leaving you feeling colder than the temperature suggests.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%82%76%68%58%52%46%39%48%59%72%76%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Lancaster for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
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 Weather9°C (49°F)41 mm (1.6 inches)78%moderate
February Weather10°C (50°F)31 mm (1.2 inches)82%high
March Weather12°C (54°F)38 mm (1.5 inches)75%very high
April Weather16°C (62°F)17 mm (0.7 inches)68%very high
May Weather19°C (67°F)7 mm (0.3 inches)57%extreme
June Weather24°C (76°F)1 mm (0.0 inches)52%extreme
July Weather28°C (82°F)2 mm (0.1 inches)46%extreme
August Weather27°C (81°F)1 mm (0.1 inches)39%extreme
September Weather24°C (76°F)2 mm (0.1 inches)48%very high
October Weather18°C (65°F)3 mm (0.1 inches)59%high
November Weather14°C (57°F)12 mm (0.5 inches)72%moderate
December Weather9°C (48°F)42 mm (1.7 inches)76%moderate

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