WEATHER · CLIMATE NORMALS · 1991–2020
Dallas Climate — Averages by Month
What the weather in Dallas, USaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 8.1 °C · coldest | 73.6 mm |
| February | 10.5 °C | 78.0 mm |
| March | 14.6 °C | 103.8 mm |
| April | 18.9 °C | 109.4 mm |
| May | 23.2 °C | 130.7 mm · wettest |
| June | 27.4 °C | 87.3 mm |
| July | 29.6 °C · warmest | 43.3 mm |
| August | 29.6 °C | 54.2 mm |
| September | 25.7 °C | 66.5 mm |
| October | 19.8 °C | 99.6 mm |
| November | 13.7 °C | 90.0 mm |
| December | 9.2 °C | 92.7 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Dallas — centred at 32.75°N, 96.75°W. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.