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December Weather in Westwood, United States

Last updated: June 24, 2025

In Westwood, United States, the average temperature in December hovers around -1°C (30°F), with lows dipping to -15°C (6°F) and highs reaching up to 13°C (55°F). This month experiences an average precipitation of 131 mm (5.2 in) spread over 11 days, contributing to a notably high humidity level of 86%. Prepare for a chilly yet moisture-laden experience!

December Temperature in Westwood

In December in Westwood, the average temperature is -1°C (30°F), with maximums reaching 13°C (55°F) and minimums dropping as low as -15°C (6°F). It’s advisable for travelers to pack warm clothing to stay comfortable during their visit.

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

The chart illustrates December temperature patterns in Westwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westwood, December typically has an average temperature of -1°C (30°F), with highs reaching up to 13°C (55°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec313235435363727061493930
Data source: Temperature data for Westwood 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 Westwood

In Westwood in December, the precipitation amount is 131 mm (5.2 in) distributed over 11 days.

December Precipitation Trends in Westwood

The chart displays monthly precipitation patterns in Westwood, 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 Westwood, December typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec16217614373581668194279131
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Westwood

In Westwood in December, humidity is 86%. With an average temperature of -1°C (30°F), this humidity feels like a heavy blanket wrapping around you, making traveling feel much colder and more uncomfortable than the temperature suggests.

December Average Humidity in Westwood

This chart illustrates the average monthly humidity levels in Westwood, 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 Westwood is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Westwood

In Westwood 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 Westwood, you can check the information here.

Maximum UV Index Levels in Westwood for December

The chart shows the monthly maximum UV Index (UVI) for Westwood 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 Westwood typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec45810121211119753
Data source: Westwood 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 Westwood Compares to Other Months

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

This table compares monthly weather conditions in Westwood, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)162 mm (6.4 inches)86%moderate
February Weather0°C (32°F)176 mm (6.9 inches)87%moderate
March Weather2°C (35°F)143 mm (5.6 inches)86%very high
April Weather6°C (43°F)73 mm (2.9 inches)83%very high
May Weather11°C (53°F)58 mm (2.3 inches)72%extreme
June Weather17°C (64°F)16 mm (0.6 inches)67%extreme
July Weather22°C (72°F)6 mm (0.2 inches)56%extreme
August Weather21°C (70°F)8 mm (0.3 inches)42%extreme
September Weather16°C (62°F)19 mm (0.7 inches)46%very high
October Weather9°C (49°F)42 mm (1.6 inches)67%high
November Weather4°C (39°F)79 mm (3.1 inches)86%moderate
December Weather-1°C (30°F)131 mm (5.2 inches)86%moderate

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