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December Weather in Westport, United States

Last updated: June 24, 2025

In Westport, United States, the average temperature in December hovers around -3°C (27°F). Expect chilly conditions, where temperatures can drop as low as -26°C (-14°F) and might peak at a milder 14°C (57°F). This month sees about 77 mm (3.0 in) of precipitation spread across 11 days, contributing to a high average humidity of 89%.

December Temperature in Westport

In December in Westport, the average temperature is -3°C (27°F). The maximum can reach 14°C (57°F), while the minimum can drop as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy 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 (27°F), with highs reaching up to 14°C (57°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec202330435665706961503627
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 77 mm (3.0 in) over the course of 11 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 77 mm (3.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec767666107911141231157214210177
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 89%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and breath a visible frost as you navigate through the wintery landscape.

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 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
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 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 Westport, you can visit Hourly UV Index in Westport.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
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 Weather-6°C (21°F)76 mm (3.0 inches)93%low
February Weather-5°C (23°F)76 mm (3.0 inches)92%moderate
March Weather-1°C (30°F)66 mm (2.6 inches)86%moderate
April Weather6°C (43°F)107 mm (4.2 inches)85%very high
May Weather13°C (56°F)91 mm (3.6 inches)80%very high
June Weather18°C (65°F)114 mm (4.5 inches)74%very high
July Weather21°C (71°F)123 mm (4.8 inches)76%very high
August Weather20°C (69°F)115 mm (4.5 inches)75%very high
September Weather16°C (62°F)72 mm (2.8 inches)78%high
October Weather10°C (50°F)142 mm (5.6 inches)86%moderate
November Weather2°C (36°F)101 mm (4.0 inches)88%moderate
December Weather-3°C (27°F)77 mm (3.0 inches)89%low

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