Average Weather in December in Fort Clark Springs Texas, United States
Daily high temperatures decrease by 5°F, from 68°F to 63°F, rarely falling below 50°F or exceeding 78°F.
Daily low temperatures decrease by 5°F, from 47°F to 43°F, rarely falling below 31°F or exceeding 60°F.
For reference, on August 6, the hottest day of the year, temperatures in Fort Clark Springs typically range from 76°F to 97°F, while on January 6, the coldest day of the year, they range from 42°F to 63°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 Fort Clark Springs experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 43%.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 63% of the time.
For reference, on January 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, 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
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Fort Clark Springs, the chance of a wet day over the course of December is essentially constant, remaining around 7% throughout.
For reference, the year's highest daily chance of a wet day is 28% on May 30, and its lowest chance is 7% on January 1.
Probability of Precipitation in December
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during December in Fort Clark Springs is essentially constant, remaining about 0.6 inches throughout, and rarely exceeding 2.0 inches.
The lowest average 31-day accumulation is 0.6 inches on December 26.
Average Monthly Rainfall in December
Over the course of December in Fort Clark Springs, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 16 minutes of daylight and the longest day is December 1, with 10 hours, 24 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Fort Clark Springs is 7:18 AM on December 1 and the latest sunrise is 17 minutes later at 7:35 AM on December 31.
The earliest sunset is 5:42 PM on December 1 and the latest sunset is 11 minutes later at 5:53 PM on December 31.
Daylight saving time is observed in Fort Clark Springs 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 6:42 AM and sets 14 hours, 1 minute later, at 8:44 PM, while on December 21, the shortest day of the year, it rises at 7:31 AM and sets 10 hours, 16 minutes later, at 5:47 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Fort Clark Springs is gradually decreasing during December, falling from 4% to 1% over the course of the month.
For reference, on June 23, the muggiest day of the year, there are muggy conditions 75% 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
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Fort Clark Springs is essentially constant during December, remaining within 0.1 miles per hour of 8.3 miles per hour throughout.
For reference, on June 6, the windiest day of the year, the daily average wind speed is 11.3 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 8.2 miles per hour.
Average Wind Speed in December
Wind Direction in December
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Fort Clark Springs typically lasts for 10 months (306 days), from around February 11 to around December 13, rarely starting after March 17, or ending before November 23.
During December in Fort Clark Springs, the chance that a given day is within the growing season is very rapidly decreasing falling from 78% to 20% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Fort Clark Springs are increasing during December, increasing by 187°F, from 7,092°F to 7,279°F, over the course of the month.
Growing Degree Days in December
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Fort Clark Springs 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 Fort Clark Springs are 29.306 deg latitude, -100.422 deg longitude, and 1,122 ft elevation.
The topography within 2 miles of Fort Clark Springs contains only modest variations in elevation, with a maximum elevation change of 135 feet and an average elevation above sea level of 1,124 feet. Within 10 miles contains only modest variations in elevation (719 feet). Within 50 miles contains significant variations in elevation (2,415 feet).
The area within 2 miles of Fort Clark Springs is covered by shrubs (67%), artificial surfaces (14%), and grassland (14%), within 10 miles by shrubs (92%), and within 50 miles by shrubs (81%).
This report illustrates the typical weather in Fort Clark Springs 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Fort Clark Springs.
For each station, the records are corrected for the elevation difference between that station and Fort Clark Springs 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 Fort Clark Springs is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fort Clark Springs and a given station.
The stations contributing to this reconstruction are: Laughlin Air Force Base (50%, 36 kilometers, west); Garner Field Airport (20%, 67 kilometers, east); Edwards County Airport (14%, 75 kilometers, north); and Piedras Negras International Airport (16%, 76 kilometers, south).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.