Winter Weather in San Marcos Mexico
Daily high temperatures increase by 6°F, from 74°F to 80°F, rarely falling below 60°F or exceeding 88°F. The lowest daily average high temperature is 70°F on January 8.
Daily low temperatures increase by 3°F, from 49°F to 52°F, rarely falling below 37°F or exceeding 60°F. The lowest daily average low temperature is 45°F on January 8.
For reference, on June 4, the hottest day of the year, temperatures in San Marcos typically range from 72°F to 96°F, while on January 7, the coldest day of the year, they range from 45°F to 70°F.
Average High and Low Temperature in the Winter in San Marcos
The figure below shows you a compact characterization of the hourly average winter temperatures. 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 the Winter in San Marcos
The winter in San Marcos experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 40% throughout the season. The highest chance of overcast or mostly cloudy conditions is 44% on December 18.
The clearest day of the winter is February 26, 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 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in the Winter in San Marcos
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 Marcos, the chance of a wet day over the course of the winter is essentially constant, remaining around 4% throughout.
For reference, the year's highest daily chance of a wet day is 26% on July 15, and its lowest chance is 2% on February 20.
Probability of Precipitation in the Winter in San Marcos
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the winter in San Marcos is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.4 inches or falling below -0.0 inches.
Average Monthly Rainfall in the Winter in San Marcos
Over the course of the winter in San Marcos, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 58 minutes, implying an average daily increase of 39 seconds, and weekly increase of 4 minutes, 35 seconds.
The shortest day of the winter is December 21, with 10 hours, 32 minutes of daylight and the longest day is February 28, with 11 hours, 37 minutes of daylight.
Hours of Daylight and Twilight in the Winter in San Marcos
The latest sunrise of the winter in San Marcos is 7:40 AM on January 13 and the earliest sunrise is 24 minutes earlier at 7:15 AM on February 28.
The earliest sunset is 6:00 PM on December 1 and the latest sunset is 53 minutes later at 6:53 PM on February 28.
Daylight saving time is observed in San Marcos during 2021, but it neither starts nor ends during the winter, so the entire season is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 7:01 AM and sets 13 hours, 45 minutes later, at 8:46 PM, while on December 21, the shortest day of the year, it rises at 7:34 AM and sets 10 hours, 32 minutes later, at 6:06 PM.
Sunrise & Sunset with Twilight in the Winter in San Marcos
The figure below presents a compact representation of key lunar data for the winter of 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 the Winter in San Marcos
The chance that a given day will be muggy in San Marcos is essentially constant during the winter, remaining around 0% throughout.
The lowest chance of a muggy day during the winter is 0% on December 22.
For reference, on September 5, the muggiest day of the year, there are muggy conditions 21% of the time, while on December 12, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in the Winter in San Marcos
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in San Marcos is gradually increasing during the winter, increasing from 5.9 miles per hour to 6.8 miles per hour over the course of the season.
For reference, on July 2, the windiest day of the year, the daily average wind speed is 8.3 miles per hour, while on December 3, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.
The lowest daily average wind speed during the winter is 5.9 miles per hour on December 3.
Average Wind Speed in the Winter in San Marcos
The wind direction in San Marcos during the winter is predominantly out of the east from December 1 to February 4 and the west from February 4 to February 28.
Wind Direction in the Winter in San Marcos
While it does not do so every year, freezing temperatures are seen in San Marcos over some winters. The day least likely to be in the growing season is January 2, with a 78% chance.
Time Spent in Various Temperature Bands and the Growing Season in the Winter in San Marcos
The average accumulated growing degree days in San Marcos are very rapidly decreasing during the winter, decreasing by 7,071°F, from 7,690°F to 618°F, over the course of the season.
Growing Degree Days in the Winter in San Marcos
The average daily incident shortwave solar energy in San Marcos is rapidly increasing during the winter, rising by 1.7 kWh, from 4.3 kWh to 6.0 kWh, over the course of the season.
The lowest average daily incident shortwave solar energy during the winter is 4.0 kWh on December 19.
Average Daily Incident Shortwave Solar Energy in the Winter in San Marcos
For the purposes of this report, the geographical coordinates of San Marcos are 25.667 deg latitude, -103.009 deg longitude, and 3,625 ft elevation.
The topography within 2 miles of San Marcos is essentially flat, with a maximum elevation change of 36 feet and an average elevation above sea level of 3,615 feet. Within 10 miles is essentially flat (1,745 feet). Within 50 miles contains very significant variations in elevation (7,500 feet).
The area within 2 miles of San Marcos is covered by shrubs (90%), within 10 miles by shrubs (61%) and grassland (21%), and within 50 miles by shrubs (66%) and herbaceous vegetation (11%).
This report illustrates the typical weather in San Marcos, 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 is only a single weather station, Francisco Sarabia International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Marcos.
At a distance of 42 kilometers from San Marcos, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and San Marcos according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for airports and weather stations are provided by AskGeo.com .