Average Weather in December in San Juan Bautista California, United States
In San Juan Bautista, the month of December is characterized by gradually falling daily high temperatures, with daily highs decreasing by 3°F, from 63°F to 60°F over the course of the month, and rarely exceeding 70°F or dropping below 53°F. The lowest daily average high temperature is 60°F on December 26.
Daily low temperatures decrease by 2°F, from 41°F to 39°F, rarely falling below 32°F or exceeding 50°F.
For reference, on September 10, the hottest day of the year, temperatures in San Juan Bautista typically range from 54°F to 78°F, while on January 3, the coldest day of the year, they range from 39°F to 60°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 San Juan Bautista experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 47% to 52%.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 53% of the time.
For reference, on February 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on July 29, 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 San Juan Bautista, the chance of a wet day over the course of December is essentially constant, remaining around 24% throughout.
For reference, the year's highest daily chance of a wet day is 30% on February 21, and its lowest chance is 0% on July 22.
Probability of Precipitation in December
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during December in San Juan Bautista is increasing, starting the month at 2.7 inches, when it rarely exceeds 5.9 inches or falls below 0.4 inches, and ending the month at 3.5 inches, when it rarely exceeds 7.2 inches or falls below 0.3 inches.
Average Monthly Rainfall in December
Over the course of December in San Juan Bautista, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 38 minutes of daylight and the longest day is December 1, with 9 hours, 49 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in San Juan Bautista is 7:00 AM on December 1 and the latest sunrise is 18 minutes later at 7:18 AM on December 31.
The earliest sunset is 4:49 PM on December 6 and the latest sunset is 10 minutes later at 4:59 PM on December 31.
Daylight saving time is observed in San Juan Bautista 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, 41 minutes later, at 8:28 PM, while on December 21, the shortest day of the year, it rises at 7:15 AM and sets 9 hours, 38 minutes later, at 4:53 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in San Juan Bautista is essentially constant during December, remaining around 0% throughout.
For reference, on September 9, 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
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in San Juan Bautista is essentially constant during December, remaining within 0.1 miles per hour of 3.3 miles per hour throughout.
For reference, on June 5, the windiest day of the year, the daily average wind speed is 4.4 miles per hour, while on October 21, the calmest day of the year, the daily average wind speed is 3.1 miles per hour.
The highest daily average wind speed during December is 3.4 miles per hour on December 14.
Average Wind Speed in December
Wind Direction in December
San Juan Bautista 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 San Juan Bautista is essentially constant during December, remaining around 55°F throughout.
Average Water Temperature in December
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in San Juan Bautista is essentially constant during December, remaining within 0.1 kWh of 2.5 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.3 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of San Juan Bautista are 36.846 deg latitude, -121.538 deg longitude, and 322 ft elevation.
The topography within 2 miles of San Juan Bautista contains very significant variations in elevation, with a maximum elevation change of 981 feet and an average elevation above sea level of 323 feet. Within 10 miles contains very significant variations in elevation (3,051 feet). Within 50 miles contains large variations in elevation (5,850 feet).
The area within 2 miles of San Juan Bautista is covered by cropland (45%) and grassland (44%), within 10 miles by grassland (45%) and cropland (23%), and within 50 miles by grassland (30%) and shrubs (20%).
This report illustrates the typical weather in San Juan Bautista 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 San Juan Bautista.
For each station, the records are corrected for the elevation difference between that station and San Juan Bautista 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 San Juan Bautista is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Juan Bautista and a given station.
The stations contributing to this reconstruction are: Hollister Municipal Airport (56%, 12 kilometers, northeast); Salinas Municipal Airport (24%, 21 kilometers, south); and Watsonville Municipal Airport (20%, 25 kilometers, northwest).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.