Average Weather in December in Mason Texas, United States
Daily high temperatures decrease by 5°F, from 65°F to 60°F, rarely falling below 45°F or exceeding 77°F.
Daily low temperatures decrease by 5°F, from 42°F to 37°F, rarely falling below 25°F or exceeding 56°F.
For reference, on August 1, the hottest day of the year, temperatures in Mason typically range from 72°F to 95°F, while on January 6, the coldest day of the year, they range from 37°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 Mason experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 39% to 44%. The highest chance of overcast or mostly cloudy conditions is 44% on December 21.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on December 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on June 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.
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 Mason, the chance of a wet day over the course of December is gradually decreasing, starting the month at 14% and ending it at 11%.
For reference, the year's highest daily chance of a wet day is 34% on May 27, and its lowest chance is 11% on January 1.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Mason is gradually decreasing, starting the month at 1.4 inches, when it rarely exceeds 3.1 inches or falls below 0.1 inches, and ending the month at 1.1 inches, when it rarely exceeds 2.7 inches.
Average Monthly Rainfall in December
Over the course of December in Mason, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 9 minutes of daylight and the longest day is December 1, with 10 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Mason is 7:17 AM on December 1 and the latest sunrise is 17 minutes later at 7:34 AM on December 31.
The earliest sunset is 5:35 PM on December 2 and the latest sunset is 11 minutes later at 5:46 PM on December 31.
Daylight saving time is observed in Mason 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 6:34 AM and sets 14 hours, 8 minutes later, at 8:43 PM, while on December 21, the shortest day of the year, it rises at 7:30 AM and sets 10 hours, 9 minutes later, at 5:39 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
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
The chance that a given day will be muggy in Mason is essentially constant during December, remaining around 0% throughout.
For reference, on June 23, the muggiest day of the year, there are muggy conditions 64% of the time, while on January 20, 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 Mason is essentially constant during December, remaining within 0.1 miles per hour of 10.2 miles per hour throughout.
For reference, on April 2, the windiest day of the year, the daily average wind speed is 12.0 miles per hour, while on September 5, the calmest day of the year, the daily average wind speed is 8.8 miles per hour.
Average Wind Speed in December
The hourly average wind direction in Mason throughout December is predominantly from the south, with a peak proportion of 42% on December 2.
Wind Direction in December
The growing season in Mason typically lasts for 8.0 months (246 days), from around March 13 to around November 14, rarely starting before February 16 or after April 6, and rarely ending before October 27 or after December 4.
The month of December in Mason is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season decreasing from 13% to 0% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Mason are gradually increasing during December, increasing by 140°F, from 6,163°F to 6,304°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Mason is essentially constant during December, remaining within 0.1 kWh of 3.3 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 3.2 kWh on December 20.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Mason are 30.749 deg latitude, -99.231 deg longitude, and 1,535 ft elevation.
The topography within 2 miles of Mason contains only modest variations in elevation, with a maximum elevation change of 315 feet and an average elevation above sea level of 1,581 feet. Within 10 miles contains only modest variations in elevation (846 feet). Within 50 miles also contains very significant variations in elevation (1,604 feet).
The area within 2 miles of Mason is covered by grassland (74%) and shrubs (24%), within 10 miles by shrubs (56%) and grassland (41%), and within 50 miles by shrubs (56%) and grassland (33%).
This report illustrates the typical weather in Mason, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Mason.
For each station, the records are corrected for the elevation difference between that station and Mason 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 Mason is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mason and a given station.
The stations contributing to this reconstruction are: Brady Curtis Field (30%, 49 kilometers, north); Llano Municipal Airport (25%, 55 kilometers, east); Kimble County Airport (24%, 58 kilometers, southwest); and Gillespie County Airport (20%, 64 kilometers, southeast).
Time zones for airports and weather stations are provided by AskGeo.com .