December Weather in Rio Vista, United States

Last updated: June 24, 2025

In December, the average temperature in Rio Vista, United States hovers around 10°C (50°F). Temperatures can vary significantly, with a minimum of 1°C (34°F) and a maximum of 24°C (75°F). Expect 90 mm (3.5 in) of precipitation over about 8 days, and be prepared for an average humidity level of 83%.

December Temperature in Rio Vista

In December in Rio Vista, the average temperature is 10°C (50°F), with maximums reaching 24°C (75°F) and minimums dropping as low as 1°C (34°F). This mild temperature range makes it a great time to explore Rio Vista comfortably.

December Weather in Rio Vista: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rio Vista, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Vista, December typically has an average temperature of 10°C (50°F), with highs reaching up to 24°C (75°F) and lows dropping to around 1°C (34°F).

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

December Precipitation in Rio Vista

In Rio Vista in December, the precipitation amount is 90 mm (3.5 in) spread over 8 days, indicating a relatively wet period for the region.

December Precipitation Trends in Rio Vista

The chart displays monthly precipitation patterns in Rio Vista, 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 Rio Vista, December typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 8 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 Rio Vista

In Rio Vista in December, humidity is 83%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration less comfortable and prompting visitors to seek cozy indoor activities.

December Average Humidity in Rio Vista

This chart illustrates the average monthly humidity levels in Rio Vista, 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 Rio Vista 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 Rio Vista

In Rio Vista 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 Rio Vista, you can check the information here.

Maximum UV Index Levels in Rio Vista for December

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

Data source: Rio Vista 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 Rio Vista Compares to Other Months

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

This table compares monthly weather conditions in Rio Vista, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	116 mm (4.6 inches)	84%	moderate
February Weather	12°C (53°F)	99 mm (3.9 inches)	84%	moderate
March Weather	13°C (56°F)	76 mm (3.0 inches)	83%	high
April Weather	17°C (62°F)	33 mm (1.3 inches)	81%	very high
May Weather	19°C (67°F)	16 mm (0.6 inches)	74%	very high
June Weather	23°C (73°F)	2 mm (0.1 inches)	64%	extreme
July Weather	23°C (74°F)	0 mm (0.0 inches)	44%	extreme
August Weather	23°C (73°F)	0 mm (0.0 inches)	36%	very high
September Weather	22°C (72°F)	1 mm (0.0 inches)	44%	very high
October Weather	19°C (66°F)	31 mm (1.2 inches)	65%	high
November Weather	13°C (56°F)	40 mm (1.6 inches)	84%	moderate
December Weather	10°C (50°F)	90 mm (3.5 inches)	83%	moderate