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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 4°C (39°F), with a minimum plunging to -18°C (1°F) and a maximum peaking at 23°C (74°F). Expect about 31 mm (1.2 in) of precipitation over 4 days, accompanied by a high average humidity of 86%. Stay prepared for a mix of chilly days and occasional warmth!

December Temperature in Pleasant Hill

In December in Pleasant Hill, the average temperature is 4°C (39°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -18°C (1°F). Be prepared for a wide range of temperatures to ensure a comfortable travel experience.

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 4°C (39°F), with highs reaching up to 23°C (74°F) and lows dropping to around -18°C (1°F).
JanFebMarAprMayJunJulAugSepOctNovDec323447546676797672574438
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 total precipitation amount is 31 mm (1.2 in) over a span of 4 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 31 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec60481059819599129123821094831
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 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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 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 Pleasant Hill, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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 Weather0°C (32°F)60 mm (2.4 inches)80%moderate
February Weather1°C (34°F)48 mm (1.9 inches)78%moderate
March Weather8°C (47°F)104 mm (4.1 inches)75%high
April Weather12°C (55°F)97 mm (3.8 inches)77%very high
May Weather19°C (66°F)195 mm (7.7 inches)82%very high
June Weather25°C (77°F)99 mm (3.9 inches)83%extreme
July Weather26°C (80°F)129 mm (5.1 inches)81%extreme
August Weather25°C (77°F)123 mm (4.8 inches)78%very high
September Weather22°C (72°F)82 mm (3.2 inches)72%very high
October Weather14°C (58°F)109 mm (4.3 inches)72%high
November Weather7°C (45°F)48 mm (1.9 inches)84%moderate
December Weather4°C (39°F)31 mm (1.2 inches)86%moderate

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