Average Weather in December in Lake Isabella California, United States
Daily high temperatures decrease by 4°F, from 56°F to 52°F, rarely falling below 43°F or exceeding 64°F. The lowest daily average high temperature is 52°F on December 26.
Daily low temperatures decrease by 2°F, from 35°F to 33°F, rarely falling below 26°F or exceeding 42°F. The lowest daily average low temperature is 33°F on December 27.
For reference, on July 26, the hottest day of the year, temperatures in Lake Isabella typically range from 63°F to 91°F, while on December 27, the coldest day of the year, they range from 33°F to 52°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 Lake Isabella 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 46% 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 49%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lake Isabella, the chance of a wet day over the course of December is increasing, starting the month at 12% and ending it at 16%.
For reference, the year's highest daily chance of a wet day is 20% on February 21, and its lowest chance is 0% on June 27.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Lake Isabella is gradually increasing, starting the month at 1.0 inches, when it rarely exceeds 2.2 inches or falls below 0.1 inches, and ending the month at 1.5 inches, when it rarely exceeds 3.4 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Lake Isabella, the length of the day is essentially constant. The shortest day of the month is December 22, with 9 hours, 45 minutes of daylight and the longest day is December 1, with 9 hours, 56 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Lake Isabella is 6:45 AM on December 1 and the latest sunrise is 18 minutes later at 7:03 AM on December 31.
The earliest sunset is 4:40 PM on December 5 and the latest sunset is 10 minutes later at 4:50 PM on December 31.
Daylight saving time is observed in Lake Isabella 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 5:38 AM and sets 14 hours, 34 minutes later, at 8:12 PM, while on December 21, the shortest day of the year, it rises at 6:59 AM and sets 9 hours, 45 minutes later, at 4:44 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Lake Isabella is essentially constant during December, remaining around 0% throughout.
For reference, on August 11, 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 Lake Isabella is essentially constant during December, remaining within 0.1 miles per hour of 6.0 miles per hour throughout.
For reference, on May 31, the windiest day of the year, the daily average wind speed is 7.8 miles per hour, while on September 17, the calmest day of the year, the daily average wind speed is 5.5 miles per hour.
The highest daily average wind speed during December is 6.1 miles per hour on December 23.
Average Wind Speed in December
Wind Direction in December
The growing season in Lake Isabella typically lasts for 7.8 months (239 days), from around March 24 to around November 18, rarely starting before February 18 or after April 17, and rarely ending before October 29 or after December 8.
The month of December in Lake Isabella is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly decreasing from 21% 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 Lake Isabella are essentially constant during December, remaining within 14°F of 4,104°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Lake Isabella is essentially constant during December, remaining within 0.1 kWh of 2.9 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.8 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Lake Isabella are 35.618 deg latitude, -118.473 deg longitude, and 2,956 ft elevation.
The topography within 2 miles of Lake Isabella contains large variations in elevation, with a maximum elevation change of 2,884 feet and an average elevation above sea level of 2,890 feet. Within 10 miles contains large variations in elevation (6,030 feet). Within 50 miles also contains extreme variations in elevation (11,850 feet).
The area within 2 miles of Lake Isabella is covered by shrubs (77%) and grassland (23%), within 10 miles by shrubs (64%) and trees (23%), and within 50 miles by shrubs (47%) and grassland (21%).
This report illustrates the typical weather in Lake Isabella 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Lake Isabella.
For each station, the records are corrected for the elevation difference between that station and Lake Isabella 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 Lake Isabella is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lake Isabella and a given station.
The stations contributing to this reconstruction are: Tehachapi Municipal Airport (36%, 54 kilometers, south); Meadows Field (20%, 56 kilometers, west); Porterville Municipal Airport (17%, 70 kilometers, northwest); and Ridgecrest Community Hospital Heliport (28%, 71 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .