nomadseason

December Weather in La Mesa, United States

Last updated: June 24, 2025

In December, the average temperature in La Mesa, United States hovers around 8°C (47°F). You can expect a minimum of -6°C (22°F) and a maximum of 23°C (73°F) throughout the month. With an average precipitation of 15 mm (0.6 in) spread over 2 days, the likelihood of rain is moderate. Additionally, the air tends to feel quite humid, with an average humidity level of 87%.

December Temperature in La Mesa

In December in La Mesa, the average temperature is 8°C (47°F). Maximums can reach 23°C (73°F) and minimums can be as low as -6°C (22°F). Be prepared for a wide range of temperatures while traveling, so layer your clothing accordingly.

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 8°C (47°F), with highs reaching up to 23°C (73°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec455058687684848377665546
Data source: Temperature data for La Mesa generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in La Mesa

In La Mesa in December, the precipitation amount is 15 mm (0.6 in) over the course of 2 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 15 mm (0.6 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec1213174426343530221415
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in La Mesa

In La Mesa in December, humidity is 87%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration uncomfortably muggy despite the cool air.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%77%65%53%51%51%60%63%74%75%83%87%
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 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in La Mesa.

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 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710121313131211965
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.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)12 mm (0.5 inches)81%moderate
February Weather10°C (51°F)13 mm (0.5 inches)77%high
March Weather15°C (59°F)17 mm (0.7 inches)65%very high
April Weather20°C (68°F)4 mm (0.1 inches)53%extreme
May Weather24°C (76°F)4 mm (0.1 inches)51%extreme
June Weather29°C (84°F)26 mm (1.0 inches)51%extreme
July Weather29°C (84°F)34 mm (1.4 inches)60%extreme
August Weather28°C (83°F)34 mm (1.4 inches)63%extreme
September Weather25°C (77°F)30 mm (1.2 inches)74%extreme
October Weather19°C (67°F)22 mm (0.9 inches)75%very high
November Weather13°C (56°F)14 mm (0.6 inches)82%high
December Weather8°C (47°F)15 mm (0.6 inches)87%moderate

Compare La Mesa's Climate with Cities Worldwide