Average Weather in Dallas Texas, United States
In Dallas, the summers are hot and muggy, the winters are cold and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 39°F to 96°F and is rarely below 26°F or above 102°F.
The hot season lasts for 3.5 months, from June 3 to September 18, with an average daily high temperature above 88°F. The hottest day of the year is August 1, with an average high of 96°F and low of 77°F.
The cool season lasts for 3.0 months, from November 24 to February 25, with an average daily high temperature below 65°F. The coldest day of the year is January 4, with an average low of 39°F and high of 56°F.
Average High and Low Temperature
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.
Average Hourly Temperature
In Dallas, 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 Dallas begins around May 28 and lasts for 5.6 months, ending around November 17. On October 5, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 74% of the time, and overcast or mostly cloudy 26% of the time.
The cloudier part of the year begins around November 17 and lasts for 6.4 months, ending around May 28. On February 24, the cloudiest day of the year, the sky is overcast or mostly cloudy 46% of the time, and clear, mostly clear, or partly cloudy 54% 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 Dallas varies throughout the year.
The wetter season lasts 6.4 months, from April 10 to October 23, with a greater than 26% chance of a given day being a wet day. The chance of a wet day peaks at 37% on May 15.
The drier season lasts 5.6 months, from October 23 to April 10. The smallest chance of a wet day is 16% on January 1.
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 37% on May 15.
Daily Chance of Precipitation
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. Dallas experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Dallas. The most rain falls during the 31 days centered around May 17, with an average total accumulation of 4.2 inches.
The least rain falls around August 1, with an average total accumulation of 1.5 inches.
Average Monthly Rainfall
The length of the day in Dallas varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 59 minutes of daylight; the longest day is June 21, with 14 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:18 AM on June 11, and the latest sunrise is 1 hour, 29 minutes later at 7:47 AM on November 4. The earliest sunset is at 5:20 PM on December 4, and the latest sunset is 3 hours, 19 minutes later at 8:39 PM on June 29.
Daylight saving time (DST) is observed in Dallas during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
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.
Dallas experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 5.3 months, from April 30 to October 7, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The muggiest day of the year is July 4, with muggy conditions 84% of the time.
The least muggy day of the year is January 21, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 Dallas experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.2 months, from October 25 to June 2, with average wind speeds of more than 5.3 miles per hour. The windiest day of the year is April 2, with an average hourly wind speed of 6.4 miles per hour.
The calmer time of year lasts for 4.7 months, from June 2 to October 25. The calmest day of the year is August 23, with an average hourly wind speed of 4.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Dallas varies throughout the year.
The wind is most often from the south for 11 months, from February 4 to December 23, with a peak percentage of 71% on July 5. The wind is most often from the north for 1.3 months, from December 23 to February 4, with a peak percentage of 38% on January 1.
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 11 to August 24, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is June 27, with an average of 6.9 kWh.
The darker period of the year lasts for 2.9 months, from November 9 to February 5, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is December 22, with an average of 2.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Dallas are 32.783 deg latitude, -96.807 deg longitude, and 446 ft elevation.
The topography within 2 miles of Dallas contains only modest variations in elevation, with a maximum elevation change of 125 feet and an average elevation above sea level of 432 feet. Within 10 miles also contains only modest variations in elevation (387 feet). Within 50 miles contains only modest variations in elevation (876 feet).
The area within 2 miles of Dallas is covered by artificial surfaces (95%), within 10 miles by artificial surfaces (87%), and within 50 miles by grassland (36%) and cropland (33%).
This report illustrates the typical weather in Dallas, 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 Dallas.
For each station, the records are corrected for the elevation difference between that station and Dallas 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 Dallas is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Dallas and a given station.
The stations contributing to this reconstruction are: Dallas Love Field (47%, 9 kilometers, northwest); Dallas Executive Airport (24%, 13 kilometers, southwest); Dallas United States Naval Air Station (20%, 16 kilometers, west); and Mesquite Metro Airport (9%, 26 kilometers, east).
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.