Average Weather in December in Running Springs California, United States
Daily high temperatures decrease by 4°F, from 52°F to 48°F, rarely falling below 38°F or exceeding 60°F. The lowest daily average high temperature is 48°F on December 24.
Daily low temperatures decrease by 2°F, from 29°F to 27°F, rarely falling below 19°F or exceeding 36°F. The lowest daily average low temperature is 27°F on December 25.
For reference, on July 28, the hottest day of the year, temperatures in Running Springs typically range from 57°F to 84°F, while on December 25, the coldest day of the year, they range from 27°F to 48°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 Running Springs experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 41%. The highest chance of overcast or mostly cloudy conditions is 41% on December 28.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 63% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 7, 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 Running Springs, the chance of a wet day over the course of December is increasing, starting the month at 10% and ending it at 14%.
For reference, the year's highest daily chance of a wet day is 17% on February 21, and its lowest chance is 1% on June 14.
Over the course of December in Running Springs, the chance of a day with only rain remains an essentially constant 7% throughout, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow remains an essentially constant 2% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Running Springs is gradually increasing, starting the month at 0.7 inches, when it rarely exceeds 1.8 inches, and ending the month at 1.1 inches, when it rarely exceeds 3.2 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 Running Springs is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.3 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Running Springs, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 52 minutes of daylight and the longest day is December 1, with 10 hours, 2 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Running Springs is 6:36 AM on December 1 and the latest sunrise is 18 minutes later at 6:54 AM on December 31.
The earliest sunset is 4:38 PM on December 4 and the latest sunset is 10 minutes later at 4:48 PM on December 31.
Daylight saving time is observed in Running Springs 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 5:37 AM and sets 14 hours, 26 minutes later, at 8:03 PM, while on December 21, the shortest day of the year, it rises at 6:50 AM and sets 9 hours, 52 minutes later, at 4:42 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Running Springs is essentially constant during December, remaining around 0% throughout.
For reference, on August 16, 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 Running Springs is essentially constant during December, remaining within 0.2 miles per hour of 7.1 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.
The highest daily average wind speed during December is 7.3 miles per hour on December 10.
Average Wind Speed in December
Wind Direction in December
Running Springs 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 Running Springs is gradually decreasing during December, falling by 2°F, from 62°F to 59°F, over the course of the month.
Average Water Temperature in December
The growing season in Running Springs typically lasts for 6.3 months (193 days), from around April 23 to around November 2, rarely starting before March 26 or after May 17, and rarely ending before October 14 or after November 19.
The month of December in Running Springs is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Running Springs are essentially constant during December, remaining within 6°F of 2,829°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Running Springs is essentially constant during December, remaining within 0.2 kWh of 3.2 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 3.0 kWh on December 22.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Running Springs are 34.208 deg latitude, -117.109 deg longitude, and 5,712 ft elevation.
The topography within 2 miles of Running Springs contains large variations in elevation, with a maximum elevation change of 3,094 feet and an average elevation above sea level of 5,770 feet. Within 10 miles contains large variations in elevation (7,382 feet). Within 50 miles also contains extreme variations in elevation (11,339 feet).
The area within 2 miles of Running Springs is covered by trees (65%) and shrubs (35%), within 10 miles by shrubs (67%) and trees (27%), and within 50 miles by shrubs (77%).
This report illustrates the typical weather in Running Springs 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Running Springs.
For each station, the records are corrected for the elevation difference between that station and Running Springs 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 Running Springs is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Running Springs and a given station.
The stations contributing to this reconstruction are: San Bernardino International Airport (19%, 17 kilometers, southwest); Southern California Logistics Airport (31%, 49 kilometers, northwest); Palm Springs International Airport (13%, 70 kilometers, southeast); Barstow Daggett County Airport (19%, 78 kilometers, north); and Twenty-Nine Palms, Marine Corps Air-Ground Combat Center (18%, 87 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .