The cool season lasts for 3.0 months, from November 25 to February 24, with an average daily high temperature below 64 °F. The figure below shows you a compact characterization of the entire year of hourly average temperatures.
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.
The cloudier part of the year begins around November 17 and lasts for 6.4 months, ending around May 28. 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.
The most rain falls during the 31 days centered around May 17, with an average total accumulation of 4.2 inches. Daylight saving time (DST) is observed in Dallas during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground.
The average hourly wind speed in Dallas experiences significant seasonal variation over the course of the year. The windier part of the year lasts for 7.2 months, from October 26 to June 2, with average wind speeds of more than 9.9 miles per hour.
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 6 to December 23, with a peak percentage of 71% on July 6.
The wind is most often from the north for 1.4 months, from December 23 to February 6, with a peak percentage of 38% on January 1. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
To characterize how pleasant the weather is in Dallas throughout the year, we compute two travel scores. The tourism score favors clear, painless days with perceived temperatures between 65 °F and 80 °F.
Based on this score, the best times of year to visit Dallas for general outdoor tourist activities are from mid April to early June and from mid September to late October, with a peak score in the first week of October. For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation.
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). 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.
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. 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 12 to August 23, with an average daily incident shortwave energy per square meter above 6.1 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.
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Dallas. 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. 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. Dallas Climate chart (explanation)Average max.
Temperatures in precipitation totals in inchesSource: NOAA Metric conversionAverage max. During the summer, the region receives warm and dry winds from the north and west, as well as hot, humid air from the Gulf of Mexico.
Dallas receives approximately 37.1 inches (942 mm) of equivalent rain per year. Vibrant wildflowers (such as the bluebonnet, Indian paintbrush and other flora) bloom in spring and are planted around the highways throughout Texas.
The weather in Dallas is also generally pleasant between late September and early December, and unlike springtime, major storms rarely form in the area. The spring and fall seasons are pleasant in Dallas, as seen in this March photograph from an Oak Cliff producing winter, daytime highs above 65 °F (18 °C) are not unusual.
On the other hand, a couple of times each year, warm and humid air from the south overrides cold, dry air, leading to freezing rain, which often causes major disruptions in the city if the roads and highways become slick. Due to the city's location inland from the Gulf Coast, the city's climate is characterized by a relatively wide annual temperature range, as well as significant weather variations in a given month.
Based on records from 1898 to 2019, the average snowfall is 2.6 inches per year. It has snowed twice during Thanksgiving Day NFL football games at Texas Stadium, in 1993 and 2007, which is comparatively early.
The month with the highest snowfall is typically February, with an average of 0.6 inches falling. On March 28, 2000, the Fort Worth Tornado impacted Dallas's neighbor Fort Worth's downtown, and a tornado in Arlington, Texas also occurred that day damaging some homes.
Four people died in Fort Worth as a result of the tornado. That day was the Retroflex's most damaging tornado outbreak since the 1957 event.
Another widespread tornado outbreak struck the area in the Dallas tornado outbreak of April 3, 2012, slightly damaging Rangers Ballpark in Arlington and damaging some planes and grounding the others at Dallas -Fort Worth International Airport and Dallas Love Field, heavily damaging an elementary school, and destroying semis in a facility. On 26 May 1908, the Trinity River reached a depth of 52.6 feet (16.03 m) and a width of 1.5 miles (2.4 km).
Five people died, 4,000 were left homeless, and property damages were estimated at $2.5 million. Now the wreckage of a shed or outhouse would move by, followed by a drowned swine or other livestock.
The construction forces of the Texas & Pacific worked feverishly to safeguard the long trestle carrying their tracks across the stream. Suddenly this whole structure turned on its side down-stream, broke loose from the rest of the track at one end and swung out into the middle of the current and began breaking up, first into large sections and then into smaller pieces, rushing madly along to some uncertain destination.
The Trinity River flooding on 8 July 1908. After the disastrous flood, the city wanted to find a way to control the reckless Trinity and to build a bridge linking Oak Cliff and Dallas. The immediate reaction was citizens and the city clamoring to build an indestructible, all- weather crossing over the Trinity.
In May 2015, the Dallas -Fort Worth Airport received a record-shattering 16.96 inches of rainfall, in a month that obliterated heavy-rainfall records virtually throughout the Southern Plains (Texas and Oklahoma, especially). Strangely enough, a very hot, dry summer followed, resulting in some parts of Texas returning to abnormally dry conditions as early as July 2015, soon after the record May rains erased years-long drought conditions over the area.
The El Niño–Southern Oscillation (ENSO) determines for the most part what the winter and spring months are like in Dallas. During the warm phase (El Niño), winter and spring are colder and receive more snow than usual.
Under the cold phase (La Niña), winter and spring are warmer and receive less snow. ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1981 to 2010.
^ Threaded ^ “Station Name: TX DALLAS LOVE Old”. ^ “Who Climate Normal for FORT WORTH/GREATER SW INT'L A, TX 1961–1990”.