December Weather in San Gabriel Mexico
Daily high temperatures decrease by 2°F, from 74°F to 72°F, rarely falling below 66°F or exceeding 78°F.
Daily low temperatures decrease by 2°F, from 40°F to 38°F, rarely falling below 30°F or exceeding 47°F.
For reference, on May 18, the hottest day of the year, temperatures in San Gabriel typically range from 54°F to 87°F, while on January 8, the coldest day of the year, they range from 37°F to 71°F.
Average High and Low Temperature in December in San Gabriel
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 in San Gabriel
The month of December in San Gabriel experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 45% to 49%.
The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 55% of the time.
For reference, on September 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 85%, while on May 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.
Cloud Cover Categories in December in San Gabriel
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Gabriel, the chance of a wet day over the course of December is essentially constant, remaining around 3% throughout.
For reference, the year's highest daily chance of a wet day is 75% on July 14, and its lowest chance is 1% on April 5.
Probability of Precipitation in December in San Gabriel
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 Gabriel is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.0 inches or falling below -0.0 inches.
The lowest average 31-day accumulation is 0.2 inches on December 14.
Average Monthly Rainfall in December in San Gabriel
Over the course of December in San Gabriel, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 51 minutes of daylight and the longest day is December 1, with 10 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in December in San Gabriel
The earliest sunrise of the month in San Gabriel is 7:12 AM on December 1 and the latest sunrise is 16 minutes later at 7:28 AM on December 31.
The earliest sunset is 6:09 PM on December 1 and the latest sunset is 12 minutes later at 6:21 PM on December 31.
Daylight saving time is observed in San Gabriel during 2021, 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 7:11 AM and sets 13 hours, 25 minutes later, at 8:36 PM, while on December 21, the shortest day of the year, it rises at 7:24 AM and sets 10 hours, 51 minutes later, at 6:16 PM.
Sunrise & Sunset with Twilight in December in San Gabriel
The figure below presents a compact representation of key lunar data for December 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in December in San Gabriel
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 Gabriel is essentially constant during December, remaining around 0% throughout.
For reference, on August 21, 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 in San Gabriel
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Gabriel is essentially constant during December, remaining within 0.1 miles per hour of 5.9 miles per hour throughout.
For reference, on March 24, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on July 26, the calmest day of the year, the daily average wind speed is 5.0 miles per hour.
The lowest daily average wind speed during December is 5.8 miles per hour on December 2.
Average Wind Speed in December in San Gabriel
The hourly average wind direction in San Gabriel throughout December is predominantly from the east, with a peak proportion of 42% on December 1.
Wind Direction in December in San Gabriel
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in San Gabriel typically lasts for 10.0 months (302 days), from around February 11 to around December 9, rarely starting after March 15, or ending before November 1.
During December in San Gabriel, the chance that a given day is within the growing season is rapidly decreasing falling from 62% to 22% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December in San Gabriel
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in San Gabriel are increasing during December, increasing by 234°F, from 4,788°F to 5,022°F, over the course of the month.
Growing Degree Days in December in San Gabriel
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 Gabriel is essentially constant during December, remaining within 0.2 kWh of 4.6 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 4.5 kWh on December 20.
Average Daily Incident Shortwave Solar Energy in December in San Gabriel
For the purposes of this report, the geographical coordinates of San Gabriel are 21.019 deg latitude, -103.014 deg longitude, and 6,207 ft elevation.
The topography within 2 miles of San Gabriel contains significant variations in elevation, with a maximum elevation change of 794 feet and an average elevation above sea level of 6,230 feet. Within 10 miles contains significant variations in elevation (3,435 feet). Within 50 miles also contains extreme variations in elevation (9,081 feet).
The area within 2 miles of San Gabriel is covered by cropland (76%) and shrubs (17%), within 10 miles by cropland (52%) and shrubs (21%), and within 50 miles by cropland (36%) and trees (27%).
This report illustrates the typical weather in San Gabriel, 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 Gabriel.
For each station, the records are corrected for the elevation difference between that station and San Gabriel 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 Gabriel is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Gabriel and a given station.
The stations contributing to this reconstruction are: Guadalajara International Airport (MMGL, 56%, 63 kilometers, southwest); Lic. Jesús Terán Peredo International Airport (MMAS, 33%, 105 kilometers, northeast); and Amado Nervo International Airport (MMEP, 11%, 195 kilometers, west).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.