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December Weather in Westport, United States

Last updated: June 24, 2025

In December, the average temperature in Westport, United States hovers around 3°C (38°F). Expect a chilly range, with minimums plummeting to -18°C (0°F) and maximums reaching a comfortable 19°C (66°F). Precipitation is moderate, with about 106 mm (4.2 in) spread over 10 days, and the air is notably humid, averaging 87%.

December Temperature in Westport

In December in Westport, the average temperature is 3°C (38°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -18°C (0°F). This variety in temperatures makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates December temperature patterns in Westport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westport, December typically has an average temperature of 3°C (38°F), with highs reaching up to 19°C (66°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec323544536573777470584337
Data source: Temperature data for Westport 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 Westport

In Westport in December, the precipitation amount is 106 mm (4.2 in) over a span of 10 days.

December Precipitation Trends in Westport

The chart displays monthly precipitation patterns in Westport, 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 Westport, December typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec86116140122131128109948399104106
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Westport

In Westport in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.

December Average Humidity in Westport

This chart illustrates the average monthly humidity levels in Westport, 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 Westport is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Westport

In Westport 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 Westport, you can check the information here.

Maximum UV Index Levels in Westport for December

The chart shows the monthly maximum UV Index (UVI) for Westport 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 Westport typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Westport 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 Westport Compares to Other Months

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

This table compares monthly weather conditions in Westport, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)86 mm (3.4 inches)87%moderate
February Weather2°C (36°F)116 mm (4.6 inches)85%moderate
March Weather7°C (44°F)140 mm (5.5 inches)86%high
April Weather12°C (53°F)122 mm (4.8 inches)84%very high
May Weather18°C (65°F)131 mm (5.2 inches)79%very high
June Weather23°C (73°F)128 mm (5.0 inches)82%extreme
July Weather25°C (77°F)109 mm (4.3 inches)79%very high
August Weather23°C (74°F)93 mm (3.7 inches)70%very high
September Weather21°C (70°F)83 mm (3.3 inches)69%very high
October Weather15°C (59°F)99 mm (3.9 inches)76%high
November Weather6°C (43°F)104 mm (4.1 inches)88%moderate
December Weather3°C (38°F)106 mm (4.2 inches)87%moderate

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