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December Weather in Pleasant Hill, United States

Last updated: June 24, 2025

In December, the average temperature in Pleasant Hill, United States hovers around 1°C (35°F). You can expect temperatures to dip as low as -21°C (-6°F) and peak at 19°C (66°F). During this month, precipitation averages 54 mm (2.1 in) over approximately 7 days, while the average humidity rests at a brisk 84%.

December Temperature in Pleasant Hill

In December in Pleasant Hill, the average temperature is 1°C (35°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -21°C (-6°F). This varied climate means you should pack for both warm and chilly conditions when traveling to Pleasant Hill during this time.

December Weather in Pleasant Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Pleasant Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pleasant Hill, December typically has an average temperature of 1°C (35°F), with highs reaching up to 19°C (66°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec273042516474777470564035
Data source: Temperature data for Pleasant Hill 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 Pleasant Hill

In Pleasant Hill in December, the precipitation amount is 54 mm (2.1 in) over a duration of 7 days.

December Precipitation Trends in Pleasant Hill

The chart displays monthly precipitation patterns in Pleasant Hill, 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 Pleasant Hill, December typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec65701141161551139699631246354
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Pleasant Hill

In Pleasant Hill in December humidity is 84%. With an average temperature of 1°C (35°F), this humidity feels like a cold, damp chill that seeps into your bones, making it feel much colder than the thermometer suggests, which can be quite uncomfortable for traveling.

December Average Humidity in Pleasant Hill

This chart illustrates the average monthly humidity levels in Pleasant Hill, 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 Pleasant Hill is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Pleasant Hill

In Pleasant Hill 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 Pleasant Hill, you can visit Hourly UV Index in Pleasant Hill.

Maximum UV Index Levels in Pleasant Hill for December

The chart shows the monthly maximum UV Index (UVI) for Pleasant Hill 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 Pleasant Hill typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec366910111098642
Data source: Pleasant Hill 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 Pleasant Hill Compares to Other Months

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

This table compares monthly weather conditions in Pleasant Hill, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)65 mm (2.6 inches)82%moderate
February Weather-1°C (30°F)70 mm (2.8 inches)83%high
March Weather5°C (42°F)113 mm (4.5 inches)84%high
April Weather11°C (51°F)116 mm (4.6 inches)85%very high
May Weather18°C (64°F)155 mm (6.1 inches)79%very high
June Weather23°C (74°F)112 mm (4.4 inches)82%extreme
July Weather25°C (77°F)95 mm (3.8 inches)80%very high
August Weather23°C (74°F)99 mm (3.9 inches)81%very high
September Weather21°C (70°F)63 mm (2.5 inches)80%very high
October Weather13°C (57°F)123 mm (4.9 inches)82%high
November Weather5°C (41°F)63 mm (2.5 inches)88%moderate
December Weather1°C (35°F)54 mm (2.1 inches)84%low

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