Dallas climate — normals and trends
Dallas (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 18.8 °C and it receives 947 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (29.3 °C on average) and the coldest is January (7.3 °C). Rainfall peaks in May.
Dallas averages 24 frost days, 116 hot days (≥ 30 °C) and 91 rainy days per year.
Dallas has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.8 °C (on 18 August 2023) and the coldest -18.9 °C (on 16 February 2021).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
DallasTexas
- coords
- 32.78°, -96.81°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.8°C
Average daily high
24.2°C
Average daily low
13.9°C
Annual rainfall
947mm
Sunshine / day
9.4h
Mean relative humidity
66%
Average peak wind
20.4km/h
Seasonal range
22.0°C
Frost days (< 0 °C)
24 d/yr
Hot days (≥ 30 °C)
116 d/yr
Rainy days (≥ 1 mm)
91 d/yr
Annual snowfall
4.8 cm
Average feels-like high
23.9 °C
Average feels-like low
12.6 °C
Average peak gust
37.6 km/h
Tropical nights (≥ 20 °C)
121 d/yr
Solar radiation
17.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.40 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
42.8 °C
18 August 2023
Coldest day
-18.9 °C
16 February 2021
Wettest day
121 mm
24 April 2004
Windiest day
51.2 km/h
15 November 1988
Strongest gust
101.5 km/h
12 September 1961
Hottest feels-like
46.1 °C
22 July 2018
Coldest feels-like
-24.2 °C
16 February 2021
Snowiest day
10.6 cm
16 December 1983
Sunniest day
13.5 h
26 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 11.5 °C | -1.3 °C | 113 mm | +52 mm |
| Feb | 15.7 °C | +0.5 °C | 57 mm | -15 mm |
| Mar | 23.9 °C | +4.4 °C | 77 mm | -16 mm |
| Apr | 25.6 °C | +1.7 °C | 148 mm | +30 mm |
| May | 28.3 °C | +0.5 °C | 95 mm | -41 mm |
| Jun | 31.8 °C | -0.1 °C | 167 mm | +91 mm |
| Jul | 33.9 °C | -0.4 °C | 58 mm | +17 mm |
| Aug | 34.2 °C | -0.4 °C | 77 mm | +32 mm |
| Sep | 32.0 °C | +1.2 °C | 26 mm | -40 mm |
| Oct | 28.5 °C | +2.9 °C | 64 mm | -22 mm |
| Nov | 22.8 °C | +3.8 °C | 113 mm | +29 mm |
| Dec | 17.3 °C | +2.8 °C | 13 mm | -55 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Dallas?
Dallas has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.8 °C and it receives 947 mm of precipitation per year.
What is the hottest day ever recorded in Dallas?
The hottest day measured in Dallas between 1940 and 2025 was 18 August 2023, reaching 42.8 °C.
What is the coldest day in Dallas?
The coldest day measured in Dallas between 1940 and 2025 was 16 February 2021, at -18.9 °C.
Does it snow in Dallas?
Yes. Dallas gets on average 4.8 cm of snow per year and has around 24 frost days.
Has the climate of Dallas warmed?
Yes: Dallas warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dallas?
The wettest day measured in Dallas between 1940 and 2025 was 24 April 2004, with 121 mm of rain in 24 hours.
What was the windiest day in Dallas?
The windiest day measured in Dallas between 1940 and 2025 was 15 November 1988, with winds reaching 51.2 km/h.
What is the warmest month in Dallas?
The warmest month in Dallas is August (29.3 °C on average); the coldest is January (7.3 °C).
How much does it rain in Dallas?
Dallas receives on average 947 mm of precipitation per year, spread over about 91 rainy days.
Is it sunny in Dallas?
Dallas gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
What is the biggest single-day snowfall in Dallas?
The heaviest 24-hour snowfall measured in Dallas between 1940 and 2025 was 16 December 1983, with 10.6 cm.
Are there tropical nights in Dallas?
Yes: Dallas has on average 121 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Dallas?
In Dallas, between 1940 and 2025, the highest apparent temperature reached 46.1 °C on 22 July 2018, and the lowest was -24.2 °C on 16 February 2021.
Compare Dallas with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dallas