December Weather in Rocklin, United States

Last updated: June 24, 2025

In December, the average temperature in Rocklin, United States hovers around 9°C (48°F). Expect a temperature range that can dip to a chilly -2°C (28°F) and peak at a warm 24°C (75°F). During this month, you can anticipate 129 mm (5.1 in) of precipitation spread over approximately 10 days, coupled with an average humidity level of 83%. Prepare for a blend of cool and warm days as well as occasional rain!

December Temperature in Rocklin

In December in Rocklin, the average temperature is 9°C (48°F). Maximum temperatures can reach 24°C (75°F), while minimum temperatures can drop as low as -2°C (28°F). Be prepared for a range of weather conditions to make the most of your travel experience.

December Weather in Rocklin: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rocklin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rocklin, December typically has an average temperature of 9°C (48°F), with highs reaching up to 24°C (75°F) and lows dropping to around -2°C (28°F).

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

December Precipitation in Rocklin

In Rocklin in December, the precipitation amount is 129 mm (5.1 in) over a span of 10 days.

December Precipitation Trends in Rocklin

The chart displays monthly precipitation patterns in Rocklin, 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 Rocklin, December typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 10 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 Rocklin

In Rocklin in December humidity is 83%. With an average temperature of 9°C (48°F), this humidity feels like an enveloping blanket, making outdoor activities quite uncomfortable and encouraging travelers to seek shelter or shade frequently.

December Average Humidity in Rocklin

This chart illustrates the average monthly humidity levels in Rocklin, 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 Rocklin is approximately 83%, 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 Rocklin

In Rocklin 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 Rocklin, you can check the information here.

Maximum UV Index Levels in Rocklin for December

The chart shows the monthly maximum UV Index (UVI) for Rocklin 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 Rocklin typically reaches 3, which falls under the moderate exposure category.

Data source: Rocklin 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 Rocklin Compares to Other Months

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

This table compares monthly weather conditions in Rocklin, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	144 mm (5.7 inches)	84%	moderate
February Weather	10°C (51°F)	139 mm (5.5 inches)	84%	moderate
March Weather	13°C (55°F)	139 mm (5.5 inches)	83%	high
April Weather	16°C (61°F)	64 mm (2.5 inches)	81%	very high
May Weather	20°C (68°F)	31 mm (1.2 inches)	74%	very high
June Weather	24°C (76°F)	5 mm (0.2 inches)	64%	extreme
July Weather	26°C (79°F)	0 mm (0.0 inches)	44%	extreme
August Weather	26°C (78°F)	0 mm (0.0 inches)	36%	very high
September Weather	23°C (74°F)	6 mm (0.2 inches)	44%	very high
October Weather	18°C (65°F)	46 mm (1.8 inches)	65%	high
November Weather	12°C (54°F)	79 mm (3.1 inches)	84%	moderate
December Weather	9°C (48°F)	129 mm (5.1 inches)	83%	moderate