Average Weather in December in Paso Robles California, United States
In Paso Robles, the month of December is characterized by gradually falling daily high temperatures, with daily highs decreasing by 3°F, from 62°F to 59°F over the course of the month, and rarely exceeding 70°F or dropping below 52°F. The lowest daily average high temperature is 59°F on December 28.
Daily low temperatures are around 37°F, rarely falling below 28°F or exceeding 48°F. The lowest daily average low temperature is 37°F on December 30.
For reference, on August 14, the hottest day of the year, temperatures in Paso Robles typically range from 54°F to 89°F, while on December 30, the coldest day of the year, they range from 37°F to 59°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 Paso Robles experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 47%. The highest chance of overcast or mostly cloudy conditions is 48% on December 29.
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 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on August 8, 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 Paso Robles, the chance of a wet day over the course of December is increasing, starting the month at 15% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 24% on February 20, and its lowest chance is 0% on July 29.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Paso Robles is increasing, starting the month at 1.6 inches, when it rarely exceeds 3.7 inches or falls below 0.1 inches, and ending the month at 2.6 inches, when it rarely exceeds 6.1 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Paso Robles, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 45 minutes of daylight and the longest day is December 1, with 9 hours, 55 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Paso Robles is 6:54 AM on December 1 and the latest sunrise is 18 minutes later at 7:12 AM on December 31.
The earliest sunset is 4:49 PM on December 5 and the latest sunset is 11 minutes later at 4:59 PM on December 31.
Daylight saving time is observed in Paso Robles 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 5:47 AM and sets 14 hours, 34 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, 45 minutes later, at 4:53 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Paso Robles is essentially constant during December, remaining around 0% throughout.
For reference, on September 14, 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 Paso Robles is essentially constant during December, remaining within 0.1 miles per hour of 4.0 miles per hour throughout.
For reference, on May 29, the windiest day of the year, the daily average wind speed is 4.7 miles per hour, while on September 10, the calmest day of the year, the daily average wind speed is 3.5 miles per hour.
The highest daily average wind speed during December is 4.1 miles per hour on December 14.
Average Wind Speed in December
Wind Direction in December
Paso Robles 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 Paso Robles 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 Paso Robles 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 Paso Robles are 35.627 deg latitude, -120.691 deg longitude, and 843 ft elevation.
The topography within 2 miles of Paso Robles contains very significant variations in elevation, with a maximum elevation change of 879 feet and an average elevation above sea level of 880 feet. Within 10 miles also contains very significant variations in elevation (1,709 feet). Within 50 miles contains very significant variations in elevation (4,967 feet).
The area within 2 miles of Paso Robles is covered by grassland (46%), artificial surfaces (28%), shrubs (16%), and cropland (11%), within 10 miles by grassland (75%) and cropland (11%), and within 50 miles by grassland (45%) and water (23%).
This report illustrates the typical weather in Paso Robles 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 Paso Robles.
For each station, the records are corrected for the elevation difference between that station and Paso Robles 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 Paso Robles is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Paso Robles and a given station.
The stations contributing to this reconstruction are: Paso Robles Municipal Airport (90%, 7 kilometers, northeast); San Luis Obispo County Airport (6%, 44 kilometers, south); and Point Piedras Blanca (4.1%, 54 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .