Average Weather in December in Golden Hills California, United States
Daily high temperatures decrease by 3°F, from 53°F to 50°F, rarely falling below 39°F or exceeding 63°F. The lowest daily average high temperature is 50°F on December 23.
Daily low temperatures are around 31°F, rarely falling below 24°F or exceeding 39°F. The lowest daily average low temperature is 31°F on December 19.
For reference, on July 29, the hottest day of the year, temperatures in Golden Hills typically range from 57°F to 87°F, while on December 19, the coldest day of the year, they range from 31°F to 50°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 Golden Hills experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 46%. The highest chance of overcast or mostly cloudy conditions is 47% on December 28.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 59% of the time.
For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 50%, while on August 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Golden Hills, the chance of a wet day over the course of December is increasing, starting the month at 11% and ending it at 16%.
For reference, the year's highest daily chance of a wet day is 19% on February 20, and its lowest chance is 0% on June 24.
Over the course of December in Golden Hills, the chance of a day with only rain remains an essentially constant 11% throughout, the chance of a day with mixed snow and rain increases from 1% to 4%, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Golden Hills is gradually increasing, starting the month at 0.9 inches, when it rarely exceeds 2.0 inches or falls below 0.1 inches, and ending the month at 1.4 inches, when it rarely exceeds 3.5 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during December in Golden Hills is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.3 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Golden Hills, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 47 minutes of daylight and the longest day is December 1, with 9 hours, 58 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Golden Hills is 6:43 AM on December 1 and the latest sunrise is 18 minutes later at 7:02 AM on December 31.
The earliest sunset is 4:41 PM on December 5 and the latest sunset is 10 minutes later at 4:52 PM on December 31.
Daylight saving time is observed in Golden Hills 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 5:40 AM and sets 14 hours, 32 minutes later, at 8:11 PM, while on December 21, the shortest day of the year, it rises at 6:58 AM and sets 9 hours, 47 minutes later, at 4:45 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Golden Hills is essentially constant during December, remaining around 0% throughout.
For reference, on August 22, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Golden Hills is essentially constant during December, remaining within 0.1 miles per hour of 7.4 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 8.8 miles per hour, while on August 23, the calmest day of the year, the daily average wind speed is 6.0 miles per hour.
The highest daily average wind speed during December is 7.5 miles per hour on December 11.
Average Wind Speed in December
Wind Direction in December
The growing season in Golden Hills typically lasts for 6.0 months (184 days), from around April 29 to around October 30, rarely starting before April 8 or after May 23, and rarely ending before October 5 or after November 22.
The month of December in Golden Hills is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually decreasing from 3% to -0% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Golden Hills are essentially constant during December, remaining within 12°F of 3,063°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Golden Hills is essentially constant during December, remaining within 0.2 kWh of 3.0 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.8 kWh on December 25.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Golden Hills are 35.142 deg latitude, -118.490 deg longitude, and 4,049 ft elevation.
The topography within 2 miles of Golden Hills contains very significant variations in elevation, with a maximum elevation change of 1,253 feet and an average elevation above sea level of 3,965 feet. Within 10 miles contains very significant variations in elevation (6,099 feet). Within 50 miles also contains extreme variations in elevation (8,717 feet).
The area within 2 miles of Golden Hills is covered by grassland (67%) and shrubs (30%), within 10 miles by shrubs (53%) and grassland (32%), and within 50 miles by shrubs (57%) and grassland (22%).
This report illustrates the typical weather in Golden Hills 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 Golden Hills.
For each station, the records are corrected for the elevation difference between that station and Golden Hills 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 Golden Hills is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Golden Hills and a given station.
The stations contributing to this reconstruction are: Tehachapi Municipal Airport (96%, 4.7 kilometers, east); Sandberg (2.9%, 49 kilometers, southwest); and Meadows Field (0.8%, 61 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .