The month of December in Los Angeles experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 35% to 40%. The highest chance of overcast or mostly cloudy conditions is 41% on December 28.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Los Angeles, the chance of a wet day over the course of December is increasing, starting the month at 12% and ending it at 18%.
The average sliding 31-day rainfall during December in Los Angeles is rapidly increasing, starting the month at 1.5 inches, when it rarely exceeds 3.4 inches, and ending the month at 2.6 inches, when it rarely exceeds 6.9 inches or falls below 0.1 inches.
Over the course of December in Los Angeles, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 53 minutes of daylight and the longest day is December 1, with 10 hours, 3 minutes of daylight.
The figure below presents a compact representation of key lunar data for December 2022. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average surface water temperature in Los Angeles is gradually decreasing during December, falling by 2°F, from 61°F to 59°F, over the course of the month.