December Weather in Monte Rio, United States

Last updated: June 24, 2025

In Monte Rio, United States, the average temperature in December hovers around 9°C (49°F). Expect a minimum of 0°C (32°F) and a comfortable maximum of 24°C (75°F). During this month, you can anticipate 102 mm (4.0 in) of precipitation spread across 9 days, with an average humidity of 84%.

December Temperature in Monte Rio

In December in Monte Rio, the average temperature is 9°C (49°F), with maximums reaching 24°C (75°F) and minimums dropping as low as 0°C (32°F). This mild climate makes Monte Rio an ideal destination for travelers seeking comfortable weather and outdoor activities during this time of year.

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

The chart illustrates December temperature patterns in Monte Rio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monte Rio, December typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (75°F) and lows dropping to around 0°C (32°F).

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

December Precipitation in Monte Rio

In Monte Rio in December, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

December Precipitation Trends in Monte Rio

The chart displays monthly precipitation patterns in Monte Rio, 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 Monte Rio, December typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Monte Rio

In Monte Rio in December, humidity is 84%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you feeling cool yet clammy.

December Average Humidity in Monte Rio

This chart illustrates the average monthly humidity levels in Monte Rio, 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 Monte Rio is approximately 84%, 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 Monte Rio

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

Maximum UV Index Levels in Monte Rio for December

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

Data source: Monte Rio 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 Monte Rio Compares to Other Months

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

This table compares monthly weather conditions in Monte Rio, 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)	140 mm (5.5 inches)	86%	moderate
February Weather	10°C (51°F)	157 mm (6.2 inches)	84%	moderate
March Weather	11°C (52°F)	96 mm (3.8 inches)	83%	high
April Weather	13°C (57°F)	47 mm (1.9 inches)	80%	very high
May Weather	16°C (60°F)	30 mm (1.2 inches)	80%	very high
June Weather	19°C (67°F)	2 mm (0.1 inches)	76%	extreme
July Weather	20°C (68°F)	0 mm (0.0 inches)	70%	extreme
August Weather	20°C (68°F)	0 mm (0.0 inches)	66%	very high
September Weather	19°C (67°F)	2 mm (0.1 inches)	68%	very high
October Weather	16°C (62°F)	43 mm (1.7 inches)	72%	high
November Weather	12°C (54°F)	61 mm (2.4 inches)	84%	moderate
December Weather	9°C (49°F)	102 mm (4.0 inches)	84%	moderate