Our weather and climate analysis offers a detailed understanding of average weather patterns for locations across the globe. Derived from 26 years of historical simulated weather data from ECMWF, it provides valuable insights into typical weather conditions, including air temperature, humidity, precipitation, cloud cover and wind. It is important to note the data is not observational, but rather derived from climate reanalysis.
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United States > Dallas, TX > Overview
Discover if upcoming months are expected to be warmer, colder, wetter, or drier than average
What is the best time to visit Dallas to enjoy the optimal weather conditions?
This quick reference weather table contains a summary of the annual climate trends in Dallas. It contains key metrics, including average monthly high & low temperatures, rainfall, humidity and UV index. The data is presented on a monthly basis, allowing you to see how each these weather components change throughout the year.
Dallas's long-term climate patterns earn these Weather Badges.
Explore the most extreme weather events in Dallas over the past 26 years, including record highs and lows for temperatures, rainfall, and wind speeds. This data is sourced from the latest ERA5 reanalysis model spanning 2000 to 2025.
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Use our Climate Finder to search locations by their temperature and humidity patterns.
Weather guides, climate insights, and travel planning stories that talk about Dallas.
Dallas experiences a subtropical climate characterized by a significant contrast between scorching summers and generally temperate winters. WeatherBox data shows that the city endures intense summer heat, with the average daily high peaking at 35.3°C (95.5°F) during the hottest month. Conversely, the colder season brings mild winters, where the average daily low drops to 3.2°C (37.8°F). While deep freezes are not the norm, temperatures rarely fall below -3.1°C (26.4°F) during the coldest snaps. This seasonal shift is substantial, showing a variation of 21.9°C (39.4°F) between the yearly extremes.
Precipitation is unevenly distributed, often arriving in heavy bursts during the late spring. The wettest conditions typically occur in May, averaging 138 mm (5 in), before transitioning into drier summer periods where rainfall can dip to an average of 43 mm (2 in). During these drier intervals, the sun is formidable; the average peak UV Index is 9.1, indicating harsh solar exposure. Distinct air currents further shape the local atmosphere, with prevailing winds blowing from the S approximately 18.5 of the year, occasionally gusting significantly higher during spring storms.
The combination of high temperatures and moisture often results in oppressive conditions for residents. While the thermometer rarely exceeds 38.8°C (101.8°F), the heat index is frequently amplified by relative humidity levels that average 69.1 during peak months. Relief is most noticeable in September, which sees the widest intraday temperature swings of 10.1°C (18.2°F), allowing for cooler evenings. For a deeper analysis of wind speeds, cloud cover, and specific monthly breakdowns, explore the advanced weather charts on WeatherBox.