Average Weather in December in Dilley Texas, United States
Daily high temperatures decrease by 5°F, from 70°F to 65°F, rarely falling below 51°F or exceeding 81°F.
Daily low temperatures decrease by 5°F, from 49°F to 44°F, rarely falling below 32°F or exceeding 64°F.
For reference, on August 5, the hottest day of the year, temperatures in Dilley typically range from 75°F to 98°F, while on January 6, the coldest day of the year, they range from 44°F to 65°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 Dilley experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 38% to 45%.
The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 62% of the time.
For reference, on January 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on June 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
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 Dilley, the chance of a wet day over the course of December is essentially constant, remaining around 10% throughout.
For reference, the year's highest daily chance of a wet day is 28% on May 22, and its lowest chance is 9% on December 14.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Dilley is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.8 inches.
The lowest average 31-day accumulation is 0.9 inches on December 17.
Average Monthly Rainfall in December
Over the course of December in Dilley, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 19 minutes of daylight and the longest day is December 1, with 10 hours, 27 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Dilley is 7:12 AM on December 1 and the latest sunrise is 17 minutes later at 7:29 AM on December 31.
The earliest sunset is 5:39 PM on December 1 and the latest sunset is 11 minutes later at 5:50 PM on December 31.
Daylight saving time is observed in Dilley 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 6:39 AM and sets 13 hours, 58 minutes later, at 8:37 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 10 hours, 19 minutes later, at 5:44 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 Dilley is decreasing during December, falling from 8% to 3% over the course of the month.
For reference, on June 28, the muggiest day of the year, there are muggy conditions 84% of the time, while on January 20, the least muggy day of the year, there are muggy conditions 1% 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 Dilley is essentially constant during December, remaining within 0.1 miles per hour of 8.2 miles per hour throughout.
For reference, on June 6, the windiest day of the year, the daily average wind speed is 10.7 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
Average Wind Speed in December
The wind direction in Dilley during December is predominantly out of the south from December 1 to December 13 and the north from December 13 to December 31.
Wind Direction in December
The growing season in Dilley typically lasts for 10 months (307 days), from around February 6 to around December 9, rarely starting after March 14, or ending before November 19.
During December in Dilley, the chance that a given day is within the growing season is very rapidly decreasing falling from 70% to 16% 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 Dilley are increasing during December, increasing by 238°F, from 7,322°F to 7,560°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Dilley is essentially constant during December, remaining within 0.1 kWh of 3.4 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 3.3 kWh on December 19.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Dilley are 28.667 deg latitude, -99.171 deg longitude, and 558 ft elevation.
The topography within 2 miles of Dilley contains only modest variations in elevation, with a maximum elevation change of 102 feet and an average elevation above sea level of 534 feet. Within 10 miles also contains only modest variations in elevation (282 feet). Within 50 miles contains only modest variations in elevation (948 feet).
The area within 2 miles of Dilley is covered by cropland (49%), grassland (28%), and shrubs (21%), within 10 miles by shrubs (49%) and cropland (31%), and within 50 miles by shrubs (63%) and grassland (21%).
This report illustrates the typical weather in Dilley, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Dilley.
For each station, the records are corrected for the elevation difference between that station and Dilley 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 Dilley is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Dilley and a given station.
The stations contributing to this reconstruction are: Cotulla–La Salle County Airport (59%, 24 kilometers, south); Pleasanton Municipal Airport (12%, 71 kilometers, northeast); Hondo Municipal Airport (10%, 77 kilometers, north); Castroville Municipal Airport (10%, 81 kilometers, north); and Garner Field Airport (9%, 82 kilometers, northwest).
Time zones for airports and weather stations are provided by AskGeo.com .