Dallas, Texas, has a humid subtropical climate, blending both continental and tropical characteristics. Located at the southern edge of Tornado Alley, the city experiences a wide range of temperatures and is prone to severe weather, including thunderstorms, hail, and tornadoes.

Summers in Dallas are extremely hot and humid, with July and August typically the warmest months. Average highs reach 96°F (36°C), with lows around 77°F (25°C), and heat indices often exceed 105°F (41°C). The all-time record high of 113°F (45°C) was recorded in June 1980. Despite occasional dry spells, summer heat is intense and persistent.

Winters are generally mild, though cold snaps known as “Blue Northers” can bring dramatic temperature swings. January sees average highs of 57°F (14°C) and lows of 37°F (3°C), with the first frost usually around November 12 and the last around March 12. Snow is rare, averaging 1.5 inches per season, though some winters see heavier accumulation. The all-time record low of −10°F (−23°C) was set in February 1899, and extreme winter events, like the February 2021 storm, can cause widespread damage to cold-sensitive plants and infrastructure.

Spring and Autumn are transitional and generally pleasant, though spring can bring severe thunderstorms and tornadoes as cold fronts from the north meet warm, humid Gulf Coast air. Late spring to early summer is the most humid period, while autumn often brings cooler, comfortable weather with occasional storms. Vibrant wildflowers such as bluebonnets and Indian paintbrush bloom throughout the region in spring.

Dallas averages 39.1 inches of rainfall annually, and daytime temperatures average 77°F (25°C) while nightly lows average 57°F (14°C). The U.S. Department of Agriculture places Dallas in Plant Hardiness Zone 8b, supporting diverse horticulture, though extreme winter events can still threaten sensitive species. Air pollution is a concern, with Dallas ranking 12th highest among U.S. cities, largely due to industrial activity in surrounding areas.

Overall, Dallas’s climate offers a mix of hot, sunny summers, mild winters, and the occasional extreme weather event, shaping both the city’s lifestyle and its urban environment.