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December Weather in Plymouth, United States

Last updated: June 24, 2025

In December, the average temperature in Plymouth, United States hovers around 1°C (35°F). While temperatures can dip as low as -22°C (-7°F), they can also rise to a pleasant 17°C (64°F). Expect 81 mm (3.2 in) of precipitation over approximately 12 days, contributing to an average humidity of 86%. Stay prepared for a chilly and damp month!

December Temperature in Plymouth

In December in Plymouth, the average temperature is 1°C (35°F). Maximums can reach 17°C (64°F) and minimums can be as low as -22°C (-7°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Plymouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plymouth, December typically has an average temperature of 1°C (35°F), with highs reaching up to 17°C (64°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec293240506270747267574134
Data source: Temperature data for Plymouth 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 Plymouth

In Plymouth in December, the precipitation amount is 81 mm (3.2 in) over a span of 12 days.

December Precipitation Trends in Plymouth

The chart displays monthly precipitation patterns in Plymouth, 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 Plymouth, December typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec7793961171271331268377959081
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Plymouth

In Plymouth in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.

December Average Humidity in Plymouth

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

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

Maximum UV Index Levels in Plymouth for December

The chart shows the monthly maximum UV Index (UVI) for Plymouth 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 Plymouth typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Plymouth 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 Plymouth Compares to Other Months

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

This table compares monthly weather conditions in Plymouth, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)77 mm (3.0 inches)88%moderate
February Weather0°C (32°F)93 mm (3.7 inches)87%moderate
March Weather4°C (40°F)96 mm (3.8 inches)87%high
April Weather10°C (50°F)117 mm (4.6 inches)87%very high
May Weather17°C (62°F)127 mm (5.0 inches)81%very high
June Weather21°C (71°F)133 mm (5.2 inches)82%very high
July Weather24°C (75°F)126 mm (5.0 inches)81%very high
August Weather22°C (72°F)83 mm (3.3 inches)78%very high
September Weather20°C (68°F)77 mm (3.0 inches)78%very high
October Weather14°C (57°F)95 mm (3.7 inches)82%high
November Weather5°C (41°F)90 mm (3.6 inches)89%moderate
December Weather1°C (35°F)81 mm (3.2 inches)86%low

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