Average Weather in December in Cathedral City California, United States
Daily high temperatures decrease by 4°F, from 72°F to 68°F, rarely falling below 59°F or exceeding 81°F. The lowest daily average high temperature is 68°F on December 25.
Daily low temperatures decrease by 4°F, from 49°F to 46°F, rarely falling below 38°F or exceeding 56°F. The lowest daily average low temperature is 46°F on December 27.
For reference, on July 13, the hottest day of the year, temperatures in Cathedral City typically range from 79°F to 107°F, while on December 26, the coldest day of the year, they range from 46°F to 68°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in December
The month of December in Cathedral City experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 34% throughout the month. The highest chance of overcast or mostly cloudy conditions is 36% on December 28.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 68% of the time.
For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 40%, while on September 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in December
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cathedral City, the chance of a wet day over the course of December is gradually increasing, starting the month at 8% and ending it at 12%.
For reference, the year's highest daily chance of a wet day is 15% on February 21, and its lowest chance is 1% on June 19.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Cathedral City is increasing, starting the month at 0.8 inches, when it rarely exceeds 1.9 inches, and ending the month at 1.3 inches, when it rarely exceeds 3.9 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Cathedral City, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 54 minutes of daylight and the longest day is December 1, with 10 hours, 4 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Cathedral City is 6:32 AM on December 1 and the latest sunrise is 18 minutes later at 6:50 AM on December 31.
The earliest sunset is 4:36 PM on December 4 and the latest sunset is 11 minutes later at 4:47 PM on December 31.
Daylight saving time is observed in Cathedral City during 2018, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:35 AM and sets 14 hours, 24 minutes later, at 7:59 PM, while on December 21, the shortest day of the year, it rises at 6:46 AM and sets 9 hours, 54 minutes later, at 4:41 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Cathedral City is essentially constant during December, remaining around 0% throughout.
For reference, on August 15, the muggiest day of the year, there are muggy conditions 15% of the time, while on November 14, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Cathedral City is essentially constant during December, remaining within 0.1 miles per hour of 6.2 miles per hour throughout.
For reference, on May 3, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on August 24, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
The highest daily average wind speed during December is 6.3 miles per hour on December 10.
Average Wind Speed in December
Wind Direction in December
Cathedral City is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Cathedral City is gradually decreasing during December, falling by 2°F, from 62°F to 60°F, over the course of the month.
Average Water Temperature in December
Temperatures in Cathedral City are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Cathedral City are increasing during December, increasing by 238°F, from 7,949°F to 8,186°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Cathedral City is essentially constant during December, remaining within 0.1 kWh of 3.3 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 3.1 kWh on December 22.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Cathedral City are 33.780 deg latitude, -116.465 deg longitude, and 361 ft elevation.
The topography within 2 miles of Cathedral City contains very significant variations in elevation, with a maximum elevation change of 1,447 feet and an average elevation above sea level of 500 feet. Within 10 miles contains very significant variations in elevation (8,317 feet). Within 50 miles also contains extreme variations in elevation (11,719 feet).
The area within 2 miles of Cathedral City is covered by shrubs (56%), artificial surfaces (33%), and cropland (12%), within 10 miles by shrubs (75%) and artificial surfaces (11%), and within 50 miles by shrubs (75%).
This report illustrates the typical weather in Cathedral City year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Cathedral City.
For each station, the records are corrected for the elevation difference between that station and Cathedral City according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Cathedral City is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cathedral City and a given station.
The stations contributing to this reconstruction are: Palm Springs International Airport (92%, 5.9 kilometers, northwest); Thermal Airport (6%, 33 kilometers, southeast); and Ramona Airport (1.4%, 93 kilometers, southwest).
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Time zones for aiports and weather stations are provided by AskGeo.com .