Dallas, Texas has a humid subtropical climate with hot summers, mild winters, and about 200 clear days per year. Average highs reach the mid-90s°F in July and August, while winter lows dip into the mid-to-upper 30s. The city sits in the North Texas prairie, where warm, moist air from the Gulf of Mexico collides with dry air from the west, creating a climate defined by extremes: triple-digit summer heat, occasional winter freezes, and some of the most active severe weather in the country.
Summer Heat: June Through September
Summer is the defining season of Dallas weather. Average highs in July and August both hover near 96°F, and overnight lows only drop to about 75°F, offering little relief. The heat often arrives in May, when average highs reach 84°F, and doesn’t fully let up until October.
What makes Dallas summers especially uncomfortable is humidity. Dew points frequently climb above 65°F during summer months, which the National Weather Service classifies as “oppressive.” At those levels, sweat doesn’t evaporate efficiently, so the air feels significantly hotter than the thermometer reads. Heat index values regularly exceed 105°F on the worst days.
Triple-digit temperatures are a normal part of summer. The year 2011 set the record with 71 days at or above 100°F, while a few unusually cool years (like 1973) recorded zero. The all-time record high is 113°F, set in June 1980. Most years, you can expect at least a handful of 100-degree days between June and September, with July and August being the peak.
Winters Are Mild but Unpredictable
Dallas winters are generally short and mild compared to most of the U.S. January, the coldest month, has an average high of 57°F and an average low of 36°F. Snow is rare, and many winters pass without any measurable accumulation. The average last freeze of spring falls on March 12, and the first freeze of fall doesn’t arrive until November 22, giving Dallas a growing season of roughly 255 days.
That said, Dallas is vulnerable to dramatic cold snaps when Arctic air plunges south across the Great Plains with nothing to block it. The all-time record low is -8°F, set in February 1899, and temperatures have dropped below zero as recently as 1989. The February 2021 winter storm, while not reflected in the long-term averages, demonstrated how quickly conditions can turn dangerous when polar air reaches North Texas. These events are infrequent but can catch the city off guard because infrastructure isn’t built for sustained freezing.
Rainfall and the Wet Season
Dallas averages roughly 37 to 40 inches of rain per year, with most of it falling in spring. May is consistently the wettest month. The record for a single month is nearly 17 inches, set in May 2015, which illustrates how extreme spring rainfall can get. Rain often comes in heavy bursts from thunderstorms rather than as prolonged drizzle, so flash flooding is a recurring concern in low-lying areas and along creek beds.
Late summer, by contrast, tends to be dry. July and August frequently record only trace amounts of rainfall, and extended dry stretches are common. This combination of wet springs and dry summers means the landscape can swing from lush green to brown and parched within a couple of months. Fall brings a secondary, smaller uptick in rainfall as frontal systems begin moving through again.
Severe Weather and Tornado Risk
Dallas sits on the southern edge of what’s informally called Tornado Alley, and severe thunderstorms are a regular feature of spring. The peak tornado season runs from March through June, with April and May producing the most activity. Western North Texas averages about 4 tornadoes per year, though individual years vary wildly. Some years see more than 20, while others see none.
Beyond tornadoes, large hail is one of the most frequent and costly severe weather hazards in the metro area. Supercell thunderstorms can produce hailstones large enough to shatter car windshields and damage roofs, and the Dallas-Fort Worth area regularly ranks among the most hail-prone metropolitan regions in the country. Severe thunderstorm winds, lightning, and flash flooding round out the list of warm-season hazards. If you’re moving to or visiting Dallas in spring, it’s worth understanding that tornado watches and severe thunderstorm warnings are a normal part of life, not rare emergencies.
Sunshine and Comfort by Season
Dallas receives about 62% of its possible sunshine, translating to roughly 200 clear days per year. That’s sunnier than most of the eastern U.S. but not quite as consistently bright as West Texas or the desert Southwest. Fall is arguably the most pleasant season: October brings average highs near 78°F, lower humidity, and reliable sunshine. November remains comfortable, with highs in the upper 60s.
Spring offers warm temperatures and green landscapes but comes with the trade-off of storm risk and higher humidity. March and April see average highs climb from the upper 60s into the mid-70s, making them popular months for outdoor activities between storm systems. The transitional months of March and October tend to have the widest day-to-day temperature swings, as competing air masses battle over the region. It’s not unusual to experience a 30-degree temperature drop in a single day when a cold front pushes through.
How Dallas Compares to Other Texas Cities
Dallas is hotter in summer than Houston or San Antonio but cooler in winter than both, thanks to its more inland, slightly more northern location. Houston is more humid year-round because of its proximity to the Gulf Coast, while San Antonio and Austin share a similar temperature profile but with less severe weather risk. Compared to West Texas cities like Lubbock or El Paso, Dallas gets significantly more rain and humidity but avoids the dust and persistent wind those areas are known for.
The city’s position in the North Texas blackland prairie means it gets the full range of continental weather patterns: Gulf moisture, Great Plains severe storms, and occasional Arctic intrusions. That variability is the single most distinctive feature of Dallas’s climate. Long-term residents often say if you don’t like the weather, wait a day.