Climate averages 1991–2020
Dallas weather
in December.
A cool, moderately wet month: the 11th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Dallas: daytime highs average 14.1°C and nights cool to about 5.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 89 mm of rain on roughly 7 days, which makes December a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 02 min on an average December day.
The nearest other city in this atlas is Irving (14 km away). In December its highs average 14.1°C, about as warm as Dallas, with 83 mm of rain.
Among the 498 cities listed in the United States, Dallas ranks joint 159th of 498 for the warmest December highs and joint 321st of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Dallas is 3.6°C warmer than that mean.
From December to January, average highs fall by 0.9°C to 13.2°C, and monthly rainfall falls from 89 mm to 71 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Dallas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 13.2°C3.8°C | 3.8°C | 71 | 7.1 | 10.310 h |
| February | 15.6°C5.7°C | 5.7°C | 76 | 7.7 | 11.011 h |
| March | 19.7°C9.6°C | 9.6°C | 100 | 9.5 | 12.012 h |
| April | 24.0°C13.9°C | 13.9°C | 107 | 8.8 | 13.013 h |
| May | 27.9°C18.7°C | 18.7°C | 127 | 10.6 | 13.814 h |
| June | 31.9°C23.0°C | 23.0°C | 83 | 8.4 | 14.314 h |
| July | 34.5°C25.3°C | 25.3°C | 41 | 5.7 | 14.114 h |
| August | 34.5°C25.4°C | 25.4°C | 53 | 5.4 | 13.413 h |
| September | 30.7°C21.5°C | 21.5°C | 63 | 5.9 | 12.412 h |
| October | 25.2°C15.6°C | 15.6°C | 97 | 7.7 | 11.411 h |
| November | 18.8°C9.6°C | 9.6°C | 88 | 7.2 | 10.511 h |
| December, selected | 14.1°C5.0°C | 5.0°C | 89 | 6.9 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Irving in DecemberUnited States · 14 kmHigh 14.1°C · Low 5.0°C · 83 mm rain
- Grand Prairie in DecemberUnited States · 18 kmHigh 14.2°C · Low 5.0°C · 83 mm rain
- Mesquite in DecemberUnited States · 19 kmHigh 13.9°C · Low 4.8°C · 94 mm rain
- Richardson in DecemberUnited States · 20 kmHigh 13.6°C · Low 4.6°C · 91 mm rain
- Carrollton in DecemberUnited States · 21 kmHigh 13.7°C · Low 4.8°C · 85 mm rain
- Garland in DecemberUnited States · 21 kmHigh 13.6°C · Low 4.6°C · 91 mm rain
- Plano in DecemberUnited States · 28 kmHigh 13.4°C · Low 4.6°C · 91 mm rain
- Arlington (Texas), United States in DecemberUnited States · 29 kmHigh 14.0°C · Low 4.8°C · 83 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Dallas) is explained once on the Dallas year overview and on the Sources, method and limits page.