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December Weather in Gettysburg, United States

Last updated: June 24, 2025

In Gettysburg, United States, the average temperature for December hovers around 2°C (36°F). While you might experience chilly lows of -18°C (-1°F), there are also milder highs reaching up to 18°C (65°F). Expect precipitation of approximately 84 mm (3.3 in) spread over about 10 days, accompanied by a noteworthy average humidity level of 87%.

December Temperature in Gettysburg

In December in Gettysburg, the average temperature is 2°C (36°F). Maximum temperatures can reach 18°C (65°F), while minimums can drop as low as -18°C (-1°F). Be prepared for a wide range of temperatures and pack accordingly for your travels!

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

The chart illustrates December temperature patterns in Gettysburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gettysburg, December typically has an average temperature of 2°C (36°F), with highs reaching up to 18°C (65°F) and lows dropping to around -18°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec303342516372757369574136
Data source: Temperature data for Gettysburg 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 Gettysburg

In Gettysburg in December, the precipitation amount is 84 mm (3.3 in) over a span of 10 days.

December Precipitation Trends in Gettysburg

The chart displays monthly precipitation patterns in Gettysburg, 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 Gettysburg, December typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec72971121001381271079987989484
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Gettysburg

In Gettysburg in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

December Average Humidity in Gettysburg

This chart illustrates the average monthly humidity levels in Gettysburg, 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 Gettysburg 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 Gettysburg

In Gettysburg 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 Gettysburg, you can check the information here.

Maximum UV Index Levels in Gettysburg for December

The chart shows the monthly maximum UV Index (UVI) for Gettysburg 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 Gettysburg typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Gettysburg 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 Gettysburg Compares to Other Months

Weather in Gettysburg varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Gettysburg, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Gettysburg, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)72 mm (2.8 inches)88%moderate
February Weather1°C (33°F)97 mm (3.8 inches)88%moderate
March Weather6°C (42°F)112 mm (4.4 inches)87%high
April Weather11°C (52°F)100 mm (3.9 inches)85%very high
May Weather17°C (64°F)137 mm (5.4 inches)81%very high
June Weather22°C (72°F)127 mm (5.0 inches)82%very high
July Weather24°C (76°F)107 mm (4.2 inches)81%very high
August Weather23°C (73°F)99 mm (3.9 inches)73%very high
September Weather20°C (69°F)87 mm (3.4 inches)73%very high
October Weather14°C (57°F)98 mm (3.9 inches)78%high
November Weather5°C (42°F)94 mm (3.7 inches)89%moderate
December Weather2°C (36°F)84 mm (3.3 inches)87%moderate

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