nomadseason

December Weather in Pleasant Hill, United States

Last updated: June 24, 2025

In December, the average temperature in Pleasant Hill, United States is a mild 12°C (54°F), with a range that can dip to a chilly -1°C (31°F) at its lowest and rise to a warm 27°C (81°F) at its highest. Expect about 137 mm (5.4 in) of precipitation throughout 9 days, contributing to an average humidity of 88%.

December Temperature in Pleasant Hill

In December in Pleasant Hill, the average temperature is 12°C (54°F). The maximum can reach 27°C (81°F), while the minimum can drop as low as -1°C (31°F). This variation in temperatures makes Pleasant Hill a versatile destination for travelers, offering both warm and cool experiences throughout the month.

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 12°C (54°F), with highs reaching up to 27°C (81°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec505362667581838379695754
Data source: Temperature data for Pleasant Hill generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 137 mm (5.4 in) over the course of 9 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 137 mm (5.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1041551251581791229814412010775137
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Pleasant Hill

In Pleasant Hill in December, humidity is 88%. With an average temperature of 12°C (54°F), this humidity feels like a thick, damp blanket, making traveling a bit uncomfortable as the air clings to your skin, causing you to sweat even in cooler weather.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%81%79%80%81%76%73%72%72%73%83%88%
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 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 Pleasant Hill for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121110864
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 Weather10°C (50°F)104 mm (4.1 inches)81%moderate
February Weather12°C (53°F)155 mm (6.1 inches)81%very high
March Weather17°C (62°F)125 mm (4.9 inches)79%very high
April Weather19°C (66°F)158 mm (6.2 inches)80%extreme
May Weather24°C (75°F)179 mm (7.1 inches)81%extreme
June Weather27°C (81°F)122 mm (4.8 inches)76%extreme
July Weather28°C (83°F)98 mm (3.9 inches)73%extreme
August Weather28°C (83°F)144 mm (5.7 inches)71%extreme
September Weather26°C (79°F)120 mm (4.7 inches)72%very high
October Weather21°C (69°F)107 mm (4.2 inches)73%very high
November Weather14°C (58°F)75 mm (3.0 inches)83%high
December Weather12°C (54°F)137 mm (5.4 inches)88%moderate

Compare Pleasant Hill's Climate with Cities Worldwide