December Weather in Chico, United States

Last updated: June 24, 2025

In December, the average temperature in Chico, United States hovers around 9°C (48°F), with a minimum dipping to 0°C (32°F) and a maximum reaching 23°C (74°F). Expect 140 mm (5.5 in) of precipitation spread over 10 days, contributing to an average humidity of 83%—making it a notably damp month.

December Temperature in Chico

In December in Chico, the average temperature is 9°C (48°F). Maximums can reach 23°C (74°F), while minimums can drop as low as 0°C (32°F). This climate makes it a great time for travelers to experience a mix of mild days and cool evenings, perfect for exploring the local attractions.

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

The chart illustrates December temperature patterns in Chico, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chico, December typically has an average temperature of 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around 0°C (32°F).

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

December Precipitation in Chico

In Chico in December, the total precipitation amount is 140 mm (5.5 in) spread over a period of 10 days.

December Precipitation Trends in Chico

The chart displays monthly precipitation patterns in Chico, 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 Chico, December typically receives around 140 mm (5.5 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 Chico

In Chico 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 Chico

This chart illustrates the average monthly humidity levels in Chico, 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 Chico 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 Chico

In Chico 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 Chico, you can check the information here.

Maximum UV Index Levels in Chico for December

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

Data source: Chico 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 Chico Compares to Other Months

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

This table compares monthly weather conditions in Chico, 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)	183 mm (7.2 inches)	84%	moderate
February Weather	10°C (51°F)	199 mm (7.8 inches)	84%	moderate
March Weather	12°C (54°F)	156 mm (6.2 inches)	83%	high
April Weather	16°C (61°F)	79 mm (3.1 inches)	81%	very high
May Weather	20°C (69°F)	47 mm (1.9 inches)	74%	very high
June Weather	26°C (79°F)	8 mm (0.3 inches)	64%	extreme
July Weather	29°C (85°F)	1 mm (0.0 inches)	44%	extreme
August Weather	28°C (83°F)	1 mm (0.0 inches)	36%	very high
September Weather	24°C (76°F)	8 mm (0.3 inches)	44%	very high
October Weather	18°C (65°F)	53 mm (2.1 inches)	65%	high
November Weather	12°C (55°F)	96 mm (3.8 inches)	84%	moderate
December Weather	9°C (48°F)	140 mm (5.5 inches)	83%	moderate