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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 9°C (49°F), with a notable range from a chilly -8°C (18°F) to a pleasant 25°C (77°F). This month typically sees about 108 mm (4.2 in) of precipitation spread over 9 days, contributing to an average humidity of 84%. Prepare for a mix of weather as you enjoy the unique atmosphere of the season!

December Temperature in Plymouth

In December in Plymouth, the average temperature is 9°C (49°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop as low as -8°C (18°F). Be prepared for a wide range of temperatures when traveling during this month in Plymouth.

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 9°C (49°F), with highs reaching up to 25°C (77°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec445053627076807975665448
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 108 mm (4.2 in) spread over 9 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 108 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9095651001141491411701257596108
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 84%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you feeling cool yet clammy.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%81%80%80%81%82%83%83%80%80%83%84%
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 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 Plymouth, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111011109853
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 Weather7°C (45°F)90 mm (3.5 inches)84%moderate
February Weather10°C (50°F)95 mm (3.7 inches)81%high
March Weather12°C (53°F)64 mm (2.5 inches)80%very high
April Weather17°C (62°F)100 mm (3.9 inches)80%very high
May Weather21°C (70°F)114 mm (4.5 inches)81%extreme
June Weather25°C (76°F)149 mm (5.9 inches)82%very high
July Weather27°C (80°F)141 mm (5.5 inches)83%extreme
August Weather26°C (79°F)170 mm (6.7 inches)82%very high
September Weather24°C (75°F)125 mm (4.9 inches)80%very high
October Weather19°C (67°F)75 mm (2.9 inches)79%very high
November Weather12°C (54°F)96 mm (3.8 inches)83%moderate
December Weather9°C (49°F)108 mm (4.2 inches)84%moderate

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