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December Weather in Gettysburg, United States

Last updated: June 24, 2025

In December, the average temperature in Gettysburg, United States hovers around -4°C (24°F), with extremes ranging from a chilling -27°C (-17°F) to a mild 17°C (64°F). This month typically sees 26 mm (1.0 in) of precipitation over 5 days, accompanied by an average humidity level of 76%.

December Temperature in Gettysburg

In December in Gettysburg, the average temperature is -4°C (24°F). The maximum can reach 17°C (64°F), while the minimum can dip as low as -27°C (-17°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and milder conditions.

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 -4°C (24°F), with highs reaching up to 17°C (64°F) and lows dropping to around -27°C (-17°F).
JanFebMarAprMayJunJulAugSepOctNovDec171532425771757264453424
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 26 mm (1.0 in) over the course of 5 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 26 mm (1.0 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec132031466367926665601226
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 76%. With an average temperature of -4°C (24°F), this humidity feels like a biting chill that cuts through layers of clothing, making travel quite uncomfortable and forcing you to constantly seek warmth and shelter.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%81%72%73%75%82%83%82%73%71%78%76%
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 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 Gettysburg, you can visit Hourly UV Index in Gettysburg.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25579101098532
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-8°C (17°F)13 mm (0.5 inches)78%low
February Weather-10°C (15°F)20 mm (0.8 inches)81%moderate
March Weather0°C (32°F)31 mm (1.2 inches)71%moderate
April Weather6°C (42°F)46 mm (1.8 inches)73%high
May Weather14°C (57°F)63 mm (2.5 inches)75%very high
June Weather22°C (71°F)67 mm (2.6 inches)82%very high
July Weather24°C (76°F)92 mm (3.6 inches)83%very high
August Weather22°C (72°F)66 mm (2.6 inches)82%very high
September Weather18°C (64°F)65 mm (2.6 inches)73%very high
October Weather7°C (46°F)60 mm (2.4 inches)71%moderate
November Weather1°C (34°F)12 mm (0.5 inches)78%moderate
December Weather-4°C (24°F)26 mm (1.0 inches)76%low

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