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December Weather in Westlake, United States

Last updated: June 24, 2025

In December, the average temperature in Westlake, United States hovers around 2°C (36°F). This chilly month can bring extreme lows of -13°C (9°F) and highs up to 15°C (60°F). Be prepared for a fair amount of precipitation as well, with 87 mm (3.4 in) expected over about 14 days. Expect a damp atmosphere with an average humidity of 86%—perfect for cozy indoor activities!

December Temperature in Westlake

In December in Westlake, the average temperature is 2°C (36°F). Maximums can reach 15°C (60°F) and minimums can be as low as -13°C (9°F). Travelers should prepare for a wide range of temperatures and dress accordingly to ensure comfort during their visit.

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

The chart illustrates December temperature patterns in Westlake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westlake, December typically has an average temperature of 2°C (36°F), with highs reaching up to 15°C (60°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec303238485970757468584336
Data source: Temperature data for Westlake 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 Westlake

In Westlake in December, the precipitation amount is 87 mm (3.4 in) over a span of 14 days.

December Precipitation Trends in Westlake

The chart displays monthly precipitation patterns in Westlake, 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 Westlake, December typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec80858611212211312488791079987
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Westlake

In Westlake in December, humidity is 86%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm for travel.

December Average Humidity in Westlake

This chart illustrates the average monthly humidity levels in Westlake, 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 Westlake is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Westlake

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

Maximum UV Index Levels in Westlake for December

The chart shows the monthly maximum UV Index (UVI) for Westlake 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 Westlake typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Westlake 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 Westlake Compares to Other Months

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

This table compares monthly weather conditions in Westlake, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)80 mm (3.2 inches)88%moderate
February Weather0°C (32°F)85 mm (3.4 inches)88%moderate
March Weather3°C (38°F)86 mm (3.4 inches)87%high
April Weather9°C (48°F)112 mm (4.4 inches)87%very high
May Weather15°C (60°F)122 mm (4.8 inches)81%very high
June Weather21°C (70°F)113 mm (4.4 inches)83%very high
July Weather24°C (76°F)124 mm (4.9 inches)82%very high
August Weather23°C (74°F)88 mm (3.5 inches)76%very high
September Weather20°C (69°F)79 mm (3.1 inches)77%very high
October Weather14°C (58°F)107 mm (4.2 inches)82%high
November Weather6°C (43°F)99 mm (3.9 inches)89%moderate
December Weather2°C (36°F)87 mm (3.4 inches)86%low

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