December Weather in La Mesa, United States

Last updated: June 24, 2025

In December, the average temperature in La Mesa, United States hovers around 14°C (57°F), with a minimum dipping to 4°C (39°F) and a comfortable maximum reaching 27°C (81°F). Expect some rainfall, as 65 mm (2.5 in) of precipitation is likely over 5 days. Humidity levels remain relatively high, averaging at 74%, making it a month of varied weather conditions.

December Temperature in La Mesa

In December in La Mesa, the average temperature is 14°C (57°F). Maximums can reach 27°C (81°F), and minimums can drop as low as 4°C (39°F). It's a perfect time to explore outdoor activities while enjoying mild weather.

December Weather in La Mesa: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in La Mesa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Mesa, December typically has an average temperature of 14°C (57°F), with highs reaching up to 27°C (81°F) and lows dropping to around 4°C (39°F).

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

December Precipitation in La Mesa

In La Mesa in December, the total precipitation amount is 65 mm (2.5 in) over the course of 5 days.

December Precipitation Trends in La Mesa

The chart displays monthly precipitation patterns in La Mesa, 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 La Mesa, December typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 5 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 La Mesa

In La Mesa in December, humidity is 74%. With an average temperature of 14°C (57°F), this humidity feels like a warm, damp blanket wrapping around you, making it slightly uncomfortable for traveling, as you may find yourself quickly sweating and in need of frequent breaks to cool down.

December Average Humidity in La Mesa

This chart illustrates the average monthly humidity levels in La Mesa, 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 La Mesa is approximately 74%, 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 La Mesa

In La Mesa in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in La Mesa for better planning.

Maximum UV Index Levels in La Mesa for December

The chart shows the monthly maximum UV Index (UVI) for La Mesa 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 La Mesa typically reaches 4, which falls under the moderate exposure category.

Data source: La Mesa 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 La Mesa Compares to Other Months

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

This table compares monthly weather conditions in La Mesa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	56 mm (2.2 inches)	72%	moderate
February Weather	13°C (56°F)	68 mm (2.7 inches)	77%	high
March Weather	14°C (57°F)	51 mm (2.0 inches)	67%	very high
April Weather	16°C (61°F)	24 mm (0.9 inches)	56%	very high
May Weather	17°C (63°F)	21 mm (0.8 inches)	46%	extreme
June Weather	19°C (67°F)	2 mm (0.1 inches)	48%	extreme
July Weather	22°C (72°F)	3 mm (0.1 inches)	46%	extreme
August Weather	23°C (74°F)	1 mm (0.1 inches)	42%	very high
September Weather	22°C (72°F)	4 mm (0.1 inches)	52%	very high
October Weather	20°C (68°F)	14 mm (0.6 inches)	58%	high
November Weather	17°C (62°F)	29 mm (1.1 inches)	66%	moderate
December Weather	14°C (57°F)	65 mm (2.5 inches)	74%	moderate