Average Weather in December in Santiago Mexico
Daily high temperatures decrease by 4°F, from 74°F to 70°F, rarely falling below 57°F or exceeding 85°F.
Daily low temperatures decrease by 4°F, from 54°F to 50°F, rarely falling below 40°F or exceeding 63°F.
For reference, on July 29, the hottest day of the year, temperatures in Santiago typically range from 73°F to 93°F, while on January 5, the coldest day of the year, they range from 50°F to 70°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 Santiago experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 36% to 41%. The highest chance of overcast or mostly cloudy conditions is 42% on December 19.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 64% of the time.
For reference, on September 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on June 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
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 Santiago, the chance of a wet day over the course of December is essentially constant, remaining around 6% throughout.
For reference, the year's highest daily chance of a wet day is 41% on September 9, and its lowest chance is 5% on December 10.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Santiago is essentially constant, remaining about 0.5 inches throughout, and rarely exceeding 1.5 inches.
The lowest average 31-day accumulation is 0.4 inches on December 17.
Average Monthly Rainfall in December
Over the course of December in Santiago, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 33 minutes of daylight and the longest day is December 1, with 10 hours, 40 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Santiago is 7:09 AM on December 1 and the latest sunrise is 17 minutes later at 7:26 AM on December 31.
The earliest sunset is 5:49 PM on December 1 and the latest sunset is 11 minutes later at 6:01 PM on December 31.
Daylight saving time is observed in Santiago 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 6:50 AM and sets 13 hours, 44 minutes later, at 8:34 PM, while on December 21, the shortest day of the year, it rises at 7:22 AM and sets 10 hours, 33 minutes later, at 5:55 PM.
Sunrise & Sunset with Twilight in December
The chance that a given day will be muggy in Santiago is essentially constant during December, remaining around 1% throughout.
For reference, on September 5, the muggiest day of the year, there are muggy conditions 70% of the time, while on January 16, 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 Santiago is essentially constant during December, remaining within 0.1 miles per hour of 6.0 miles per hour throughout.
For reference, on July 4, the windiest day of the year, the daily average wind speed is 8.9 miles per hour, while on December 17, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.
The lowest daily average wind speed during December is 5.9 miles per hour on December 17.
Average Wind Speed in December
Wind Direction in December
Temperatures in Santiago are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Santiago are increasing during December, increasing by 331°F, from 7,495°F to 7,826°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Santiago is essentially constant during December, remaining within 0.1 kWh of 4.1 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 4.0 kWh on December 19.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Santiago are 25.425 deg latitude, -100.152 deg longitude, and 1,765 ft elevation.
The topography within 2 miles of Santiago contains very significant variations in elevation, with a maximum elevation change of 1,243 feet and an average elevation above sea level of 1,670 feet. Within 10 miles contains very significant variations in elevation (8,520 feet). Within 50 miles also contains extreme variations in elevation (11,677 feet).
The area within 2 miles of Santiago is covered by cropland (55%), trees (21%), shrubs (12%), and water (12%), within 10 miles by trees (62%) and cropland (28%), and within 50 miles by shrubs (40%) and trees (27%).
This report illustrates the typical weather in Santiago 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Santiago.
For each station, the records are corrected for the elevation difference between that station and Santiago 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 Santiago is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santiago and a given station.
The stations contributing to this reconstruction are: General Mariano Escobedo International Airport (83%, 40 kilometers, north) and Plan de Guadalupe International Airport (17%, 79 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .