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December Weather in Westlake, United States

Last updated: June 24, 2025

In December, the average temperature in Westlake, United States is a crisp 11°C (51°F). Be prepared for a wide temperature range, with minimums dipping to -6°C (22°F) and maximums soaring up to 29°C (84°F). Expect about 52 mm (2.0 in) of precipitation spread over 7 days, accompanied by an average humidity of 87%, creating a refreshing atmosphere.

December Temperature in Westlake

In December in Westlake, the average temperature is 11°C (51°F). The maximum can reach 29°C (84°F), and the minimum can be as low as -6°C (22°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

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 11°C (51°F), with highs reaching up to 29°C (84°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec464960657481858579675651
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 52 mm (2.0 in) over a duration of 7 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 52 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec5289100104150884087791335452
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 87%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill wrapping around you, making outdoor excursions a bit uncomfortable as the air feels thick and heavy, urging you to seek shelter more often than not.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Westlake for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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 Weather8°C (46°F)52 mm (2.0 inches)80%moderate
February Weather9°C (49°F)89 mm (3.5 inches)79%high
March Weather16°C (60°F)100 mm (3.9 inches)78%very high
April Weather18°C (65°F)104 mm (4.1 inches)78%very high
May Weather24°C (75°F)150 mm (5.9 inches)81%extreme
June Weather27°C (82°F)88 mm (3.5 inches)78%extreme
July Weather30°C (85°F)40 mm (1.6 inches)73%extreme
August Weather29°C (85°F)87 mm (3.4 inches)66%extreme
September Weather26°C (79°F)79 mm (3.1 inches)65%very high
October Weather20°C (68°F)133 mm (5.2 inches)72%very high
November Weather13°C (56°F)54 mm (2.1 inches)82%high
December Weather11°C (51°F)52 mm (2.0 inches)87%moderate

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