December Weather in Pleasant Hill, United States

Last updated: June 24, 2025

In December, the average temperature in Pleasant Hill, United States hovers around 8°C (47°F). Expect a chill in the air with minimum temperatures dipping to -7°C (19°F), while the mercury can rise to a pleasant maximum of 23°C (74°F). Be prepared for damp conditions, as 107 mm (4.2 in) of precipitation is expected over 9 days, contributing to an average humidity level of 86%.

December Temperature in Pleasant Hill

In December in Pleasant Hill, the average temperature is 8°C (47°F). The maximum can reach 23°C (74°F), and the minimum can be as low as -7°C (19°F). Be prepared for a wide range of temperatures, making it essential to pack both warm and light clothing for your trip.

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 8°C (47°F), with highs reaching up to 23°C (74°F) and lows dropping to around -7°C (19°F).

Data source: Temperature data for Pleasant Hill generated using information from the Copernicus Climate Change Service.

December Precipitation in Pleasant Hill

In Pleasant Hill in December, the precipitation amount is 107 mm (4.2 in), occurring over a span 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 107 mm (4.2 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Pleasant Hill

In Pleasant Hill in December, humidity is 86%. With an average temperature of 8°C (47°F), this humidity feels like a chilling damp that penetrates your clothes, making outdoor adventures less enjoyable and encouraging you to seek warmth indoors rather than explore the sights.

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.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	91 mm (3.6 inches)	85%	moderate
February Weather	9°C (49°F)	113 mm (4.4 inches)	82%	high
March Weather	11°C (53°F)	81 mm (3.2 inches)	81%	very high
April Weather	16°C (62°F)	100 mm (3.9 inches)	80%	very high
May Weather	21°C (70°F)	117 mm (4.6 inches)	81%	extreme
June Weather	24°C (76°F)	106 mm (4.2 inches)	81%	extreme
July Weather	27°C (80°F)	106 mm (4.2 inches)	81%	extreme
August Weather	26°C (78°F)	127 mm (5.0 inches)	80%	very high
September Weather	23°C (74°F)	143 mm (5.6 inches)	79%	very high
October Weather	18°C (65°F)	84 mm (3.3 inches)	80%	very high
November Weather	10°C (51°F)	80 mm (3.1 inches)	85%	moderate
December Weather	8°C (47°F)	107 mm (4.2 inches)	86%	moderate