Average Weather in December in Los Osos California, United States
In Los Osos, the month of December is characterized by gradually falling daily high temperatures, with daily highs decreasing by 2°F, from 64°F to 62°F over the course of the month, and rarely exceeding 71°F or dropping below 55°F. The lowest daily average high temperature is 62°F on December 25.
Daily low temperatures are around 44°F, rarely falling below 36°F or exceeding 53°F. The lowest daily average low temperature is 44°F on December 27.
For reference, on September 11, the hottest day of the year, temperatures in Los Osos typically range from 55°F to 74°F, while on December 27, the coldest day of the year, they range from 44°F to 62°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 Los Osos experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 39% to 46%. The highest chance of overcast or mostly cloudy conditions is 46% on December 29.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on February 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on August 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Los Osos, the chance of a wet day over the course of December is increasing, starting the month at 15% and ending it at 19%.
For reference, the year's highest daily chance of a wet day is 25% on February 20, and its lowest chance is 0% on July 27.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Los Osos is increasing, starting the month at 1.6 inches, when it rarely exceeds 3.5 inches or falls below 0.1 inches, and ending the month at 2.5 inches, when it rarely exceeds 5.8 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Los Osos, the length of the day is essentially constant. The shortest day of the month is December 20, with 9 hours, 46 minutes of daylight and the longest day is December 1, with 9 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Los Osos is 6:53 AM on December 1 and the latest sunrise is 18 minutes later at 7:12 AM on December 31.
The earliest sunset is 4:50 PM on December 5 and the latest sunset is 11 minutes later at 5:01 PM on December 31.
Daylight saving time is observed in Los Osos during 2017, 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 5:48 AM and sets 14 hours, 33 minutes later, at 8:21 PM, while on December 21, the shortest day of the year, it rises at 7:08 AM and sets 9 hours, 46 minutes later, at 4:54 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Los Osos is essentially constant during December, remaining around 0% throughout.
For reference, on July 6, 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 Los Osos is essentially constant during December, remaining within 0.1 miles per hour of 4.7 miles per hour throughout.
For reference, on May 24, the windiest day of the year, the daily average wind speed is 5.5 miles per hour, while on September 16, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.
The highest daily average wind speed during December is 4.7 miles per hour on December 14.
Average Wind Speed in December
Wind Direction in December
Los Osos 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 Los Osos is essentially constant during December, remaining within 1°F of 57°F throughout.
Average Water Temperature in December
The average daily incident shortwave solar energy in Los Osos is essentially constant during December, remaining within 0.2 kWh of 2.8 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.6 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Los Osos are 35.311 deg latitude, -120.832 deg longitude, and 138 ft elevation.
The topography within 2 miles of Los Osos contains very significant variations in elevation, with a maximum elevation change of 1,079 feet and an average elevation above sea level of 220 feet. Within 10 miles contains very significant variations in elevation (2,762 feet). Within 50 miles contains large variations in elevation (4,236 feet).
The area within 2 miles of Los Osos is covered by artificial surfaces (34%), herbaceous vegetation (17%), cropland (13%), and grassland (12%), within 10 miles by water (37%) and grassland (31%), and within 50 miles by water (44%) and grassland (32%).
This report illustrates the typical weather in Los Osos 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 Los Osos.
For each station, the records are corrected for the elevation difference between that station and Los Osos 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 Los Osos is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Los Osos and a given station.
The stations contributing to this reconstruction are: San Luis Obispo County Airport (69%, 19 kilometers, southeast); Paso Robles Municipal Airport (17%, 44 kilometers, northeast); and Point Piedras Blanca (14%, 57 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .