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December Weather in Sunbury, United States

Last updated: June 24, 2025

In Sunbury, United States, the average temperature in December hovers around 2°C (36°F). While it can dip as low as -17°C (2°F), temperatures may rise to a pleasant 18°C (65°F). Expect a total precipitation of 104 mm (4.1 in) over 12 days, with humidity levels averaging a high 86%.

December Temperature in Sunbury

In December in Sunbury, the average temperature is 2°C (36°F). Maximums can reach 18°C (65°F) and minimums can be as low as -17°C (2°F). Be prepared for a wide range of temperatures and pack accordingly for your trip.

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

The chart illustrates December temperature patterns in Sunbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunbury, 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 -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec303341516371757368574136
Data source: Temperature data for Sunbury 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 Sunbury

In Sunbury in December, the total precipitation amount is 104 mm (4.1 in) spread over 12 days.

December Precipitation Trends in Sunbury

The chart displays monthly precipitation patterns in Sunbury, 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 Sunbury, December typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec861101111251291511147688102100104
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sunbury

In Sunbury in December, humidity is 86%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm for travel.

December Average Humidity in Sunbury

This chart illustrates the average monthly humidity levels in Sunbury, 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 Sunbury is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sunbury

In Sunbury 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 Sunbury, you can visit Hourly UV Index in Sunbury.

Maximum UV Index Levels in Sunbury for December

The chart shows the monthly maximum UV Index (UVI) for Sunbury 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 Sunbury typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Sunbury 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 Sunbury Compares to Other Months

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

This table compares monthly weather conditions in Sunbury, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)86 mm (3.4 inches)88%moderate
February Weather1°C (34°F)110 mm (4.3 inches)87%moderate
March Weather5°C (42°F)111 mm (4.4 inches)87%high
April Weather11°C (51°F)125 mm (4.9 inches)87%very high
May Weather17°C (63°F)129 mm (5.1 inches)81%very high
June Weather22°C (71°F)151 mm (5.9 inches)82%very high
July Weather24°C (75°F)114 mm (4.5 inches)81%very high
August Weather23°C (73°F)76 mm (3.0 inches)78%very high
September Weather20°C (68°F)88 mm (3.4 inches)78%very high
October Weather14°C (57°F)102 mm (4.0 inches)82%high
November Weather5°C (41°F)100 mm (3.9 inches)89%moderate
December Weather2°C (36°F)104 mm (4.1 inches)86%low

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