Average Weather in December in Unión de San Antonio Mexico
Daily high temperatures decrease by 3°F, from 74°F to 72°F, rarely falling below 66°F or exceeding 79°F.
Daily low temperatures decrease by 2°F, from 43°F to 41°F, rarely falling below 35°F or exceeding 49°F.
For reference, on May 18, the hottest day of the year, temperatures in Unión de San Antonio typically range from 57°F to 86°F, while on January 7, the coldest day of the year, they range from 41°F to 71°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 Unión de San Antonio experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 46% throughout the month.
The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 56% of the time.
For reference, on September 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 82%, while on May 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.
Cloud Cover Categories in December
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 Unión de San Antonio, 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 61% on July 16, and its lowest chance is 2% on March 28.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Unión de San Antonio is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches.
The lowest average 31-day accumulation is 0.2 inches on December 13.
Average Monthly Rainfall in December
Over the course of December in Unión de San Antonio, 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
The earliest sunrise of the month in Unión de San Antonio is 7:08 AM on December 1 and the latest sunrise is 16 minutes later at 7:24 AM on December 31.
The earliest sunset is 6:05 PM on December 1 and the latest sunset is 12 minutes later at 6:17 PM on December 31.
Daylight saving time is observed in Unión de San Antonio 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 7:07 AM and sets 13 hours, 25 minutes later, at 8:32 PM, while on December 21, the shortest day of the year, it rises at 7:20 AM and sets 10 hours, 51 minutes later, at 6:11 PM.
Sunrise & Sunset with Twilight in December
The chance that a given day will be muggy in Unión de San Antonio is essentially constant during December, remaining around 0% throughout.
For reference, on July 30, 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Unión de San Antonio is essentially constant during December, remaining within 0.1 miles per hour of 7.2 miles per hour throughout.
For reference, on March 24, the windiest day of the year, the daily average wind speed is 8.2 miles per hour, while on May 28, the calmest day of the year, the daily average wind speed is 6.8 miles per hour.
The lowest daily average wind speed during December is 7.2 miles per hour on December 2.
Average Wind Speed in December
Wind Direction in December
While it does not do so every year, freezing temperatures are seen in Unión de San Antonio over some winters. The day least likely to be in the growing season is January 8, with a 59% chance.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Unión de San Antonio are increasing during December, increasing by 256°F, from 5,119°F to 5,375°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Unión de San Antonio is essentially constant during December, remaining within 0.1 kWh of 4.7 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 4.6 kWh on December 20.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Unión de San Antonio are 21.127 deg latitude, -102.006 deg longitude, and 6,296 ft elevation.
The topography within 2 miles of Unión de San Antonio contains significant variations in elevation, with a maximum elevation change of 604 feet and an average elevation above sea level of 6,327 feet. Within 10 miles contains significant variations in elevation (1,348 feet). Within 50 miles contains very significant variations in elevation (4,560 feet).
The area within 2 miles of Unión de San Antonio is covered by grassland (59%) and shrubs (17%), within 10 miles by grassland (56%) and shrubs (21%), and within 50 miles by grassland (38%) and cropland (28%).
This report illustrates the typical weather in Unión de San Antonio 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 Unión de San Antonio.
For each station, the records are corrected for the elevation difference between that station and Unión de San Antonio 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 Unión de San Antonio is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Unión de San Antonio and a given station.
The stations contributing to this reconstruction are: Del Bajío International Airport (52%, 57 kilometers, east); Lic. Jesús Terán Peredo International Airport (37%, 72 kilometers, northwest); and Guadalajara International Airport (12%, 152 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .