Average Weather in Del Rio Texas, United States

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4. Val Verde County
5. Del Rio

In Del Rio, the summers are long, hot, and muggy; the winters are short, cool, and dry; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 42°F to 97°F and is rarely below 31°F or above 103°F.

The hot season lasts for 4.0 months, from May 18 to September 18, with an average daily high temperature above 90°F. The hottest day of the year is August 7, with an average high of 97°F and low of 77°F.

The cool season lasts for 2.8 months, from November 23 to February 16, with an average daily high temperature below 70°F. The coldest day of the year is January 5, with an average low of 42°F and high of 63°F.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

In Del Rio, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Del Rio begins around May 8 and lasts for 2.1 months, ending around July 11. On June 11, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 78% of the time, and overcast or mostly cloudy 22% of the time.

The cloudier part of the year begins around July 11 and lasts for 9.9 months, ending around May 8. On December 19, the cloudiest day of the year, the sky is overcast or mostly cloudy 42% of the time, and clear, mostly clear, or partly cloudy 58% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Del Rio varies throughout the year.

The wetter season lasts 5.2 months, from April 27 to October 3, with a greater than 16% chance of a given day being a wet day. The chance of a wet day peaks at 25% on May 30.

The drier season lasts 6.8 months, from October 3 to April 27. The smallest chance of a wet day is 6% on December 16.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 25% on May 30.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Del Rio experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from January 31 to December 5, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 19, with an average total accumulation of 2.0 inches.

The rainless period of the year lasts for 1.8 months, from December 5 to January 31. The least rain falls around December 18, with an average total accumulation of 0.4 inches.

The length of the day in Del Rio varies significantly over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 16 minutes of daylight; the longest day is June 21, with 14 hours, 2 minutes of daylight.

The earliest sunrise is at 6:43 AM on June 10, and the latest sunrise is 1 hour, 16 minutes later at 7:59 AM on November 4. The earliest sunset is at 5:44 PM on December 2, and the latest sunset is 3 hours, 3 minutes later at 8:47 PM on June 30.

Daylight saving time (DST) is observed in Del Rio during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

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.

Del Rio experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.2 months, from April 20 to October 25, during which time the comfort level is muggy, oppressive, or miserable at least 16% of the time. The muggiest day of the year is June 23, with muggy conditions 65% of the time.

The least muggy day of the year is January 20, when muggy conditions are essentially unheard of.

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 Del Rio experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from February 28 to August 24, with average wind speeds of more than 5.4 miles per hour. The windiest day of the year is June 25, with an average hourly wind speed of 6.3 miles per hour.

The calmer time of year lasts for 6.1 months, from August 24 to February 28. The calmest day of the year is December 17, with an average hourly wind speed of 4.5 miles per hour.

The predominant average hourly wind direction in Del Rio is from the south throughout the year.

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.4 months, from April 6 to August 19, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is June 14, with an average of 7.3 kWh.

The darker period of the year lasts for 2.8 months, from November 9 to February 2, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest day of the year is December 19, with an average of 3.4 kWh.

For the purposes of this report, the geographical coordinates of Del Rio are 29.363 deg latitude, -100.897 deg longitude, and 984 ft elevation.

The topography within 2 miles of Del Rio contains only modest variations in elevation, with a maximum elevation change of 200 feet and an average elevation above sea level of 973 feet. Within 10 miles contains only modest variations in elevation (492 feet). Within 50 miles contains significant variations in elevation (3,780 feet).

The area within 2 miles of Del Rio is covered by shrubs (54%) and artificial surfaces (33%), within 10 miles by shrubs (89%), and within 50 miles by shrubs (94%).

This report illustrates the typical weather in Del Rio, 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 Del Rio.

For each station, the records are corrected for the elevation difference between that station and Del Rio 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 Del Rio is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Del Rio and a given station.

The stations contributing to this reconstruction are: Del Rio International Airport (91%, 2.0 kilometers, west) and Laughlin Air Force Base (9%, 11 kilometers, east).

Other Data

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.