December is one of the cooler months of the year in Dallas, with average highs near 11.9°C and lows around 1.2°C (mean 6.6°C). It is a relatively wet time of year, averaging 119 mm of rainfall and 83% relative humidity across the period.
December is one of the cooler months of the year in Dallas. Across 45 years of records, the warmest December in Dallas was 2015 — when the month averaged 12.4°C — while the coldest was 1989 at 1.1°C. Typical December days reach 11.9°C with nights near 1.2°C. The long-term trend is warming, about 0.7°C per decade.
December is a relatively wet time of year in Dallas, averaging 119 mm of rainfall. The wettest December on record was 2015 with 286 mm, while the driest was 2010 at 35 mm.
Relative humidity in Dallas during December averages 83%. The most humid December was 2018 at 89%, and the least humid was 2025 at 75%.
December receives about 2.4 kWh/m²/day of solar energy in Dallas. The sunniest December was 2006 at 2.8 kWh/m²/day, and the cloudiest was 1992 at 1.9.
Average wind speed in Dallas during December is 0.1 m/s. The windiest December was 2006 at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.2°C | 6.6°C | 5.9°C | 7.6°C | 7.9°C | +2.7°C |
| Avg High | 10.4°C | 11.7°C | 11.4°C | 12.8°C | 13.7°C | +3.3°C |
| Avg Low | 0.0°C | 1.4°C | 0.5°C | 2.4°C | 2.2°C | +2.2°C |
| Avg Rain | 121 mm | 105 mm | 114 mm | 148 mm | 97 mm | -24 mm |
December temperatures in Dallas have risen by about 2.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -16.3°C (1983) to a record high of 25.3°C (2007).
Rainfall in December is a relatively wet time of year, averaging 119 mm, with a wettest year of 286 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.8°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit Dallas
If your dates are flexible, the more temperate months of September and May tend to be the most comfortable for visiting Dallas. That said, December — with days averaging 11.9°C and nights around 1.2°C (mean 6.6°C) and higher rainfall (119 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.9°C | 7.6°C | 1.2°C | 24.4°C | -7.6°C | 41 mm | 75% | 0.1 m/s | — |
| 2024 | 12.5°C | 6.9°C | 1.4°C | 21.8°C | -6.7°C | 113 mm | 80% | 0.1 m/s | 2.6 |
| 2023 | 14.2°C | 8.1°C | 2.0°C | 21.0°C | -5.2°C | 112 mm | 76% | 0.1 m/s | 2.5 |
| 2022 | 12.1°C | 7.2°C | 2.2°C | 23.8°C | -12.8°C | 113 mm | 84% | 0.1 m/s | 2.2 |
| 2021 | 17.9°C | 11.9°C | 6.0°C | 23.6°C | -3.3°C | 116 mm | 84% | 0.1 m/s | 2.1 |
| 2020 | 11.6°C | 5.9°C | 0.1°C | 18.8°C | -6.0°C | 87 mm | 84% | 0.1 m/s | 2.7 |
| 2019 | 13.8°C | 8.7°C | 3.5°C | 21.7°C | -3.9°C | 139 mm | 84% | 0.1 m/s | 2.3 |
| 2018 | 11.0°C | 6.8°C | 2.6°C | 21.1°C | -4.7°C | 251 mm | 89% | 0.1 m/s | 2.1 |
| 2017 | 11.6°C | 6.4°C | 1.2°C | 21.9°C | -6.7°C | 77 mm | 80% | 0.1 m/s | 2.2 |
| 2016 | 13.4°C | 7.5°C | 1.7°C | 23.2°C | -5.8°C | 81 mm | 79% | 0.1 m/s | 2.3 |
| 2015 🔥 🌧️ | 17.2°C | 12.4°C | 7.7°C | 24.1°C | -4.3°C | 286 mm | 89% | 0.1 m/s | 2.2 |
| 2014 | 13.4°C | 8.2°C | 3.0°C | 20.9°C | -4.3°C | 124 mm | 86% | 0.1 m/s | 2.3 |
| 2013 | 12.2°C | 7.0°C | 1.8°C | 24.0°C | -6.0°C | 210 mm | 86% | 0.1 m/s | 2.1 |
| 2012 | 14.8°C | 9.2°C | 3.6°C | 22.6°C | -4.5°C | 158 mm | 81% | 0.1 m/s | 2.2 |
| 2011 | 14.0°C | 8.3°C | 2.7°C | 20.4°C | -4.2°C | 120 mm | 85% | 0.1 m/s | 2.5 |
| 2010 | 7.0°C | 1.7°C | -3.6°C | 15.0°C | -10.9°C | 35 mm | 77% | 0.1 m/s | 2.5 |
| 2009 | 9.2°C | 4.4°C | -0.3°C | 19.0°C | -5.1°C | 204 mm | 88% | 0.1 m/s | 2 |
| 2008 | 12.4°C | 7.3°C | 2.2°C | 19.5°C | -9.3°C | 163 mm | 84% | 0.1 m/s | 2.1 |
| 2007 | 15.1°C | 9.3°C | 3.5°C | 25.3°C | -5.0°C | 101 mm | 79% | 0.1 m/s | 2.3 |
| 2006 | 14.5°C | 8.3°C | 2.1°C | 20.6°C | -7.3°C | 72 mm | 81% | 0.2 m/s | 2.8 |
| 2005 | 9.7°C | 4.2°C | -1.3°C | 17.2°C | -5.6°C | 100 mm | 82% | 0.1 m/s | 2.6 |
| 2004 | 11.3°C | 5.6°C | -0.1°C | 21.9°C | -7.3°C | 107 mm | 82% | 0.1 m/s | 2.7 |
| 2003 | 10.6°C | 4.5°C | -1.6°C | 16.6°C | -5.9°C | 78 mm | 80% | 0.1 m/s | 2.7 |
| 2002 | 10.1°C | 5.1°C | 0.1°C | 16.4°C | -5.6°C | 179 mm | 87% | 0.1 m/s | 2.3 |
| 2001 | 14.6°C | 8.8°C | 3.0°C | 23.3°C | -6.4°C | 81 mm | 78% | 0.1 m/s | 2.6 |
| 2000 | 6.5°C | 1.7°C | -3.1°C | 17.6°C | -10.2°C | 56 mm | 82% | 0.1 m/s | 2.3 |
| 1999 | 13.4°C | 6.9°C | 0.5°C | 21.1°C | -6.8°C | 56 mm | 75% | 0.1 m/s | 2.7 |
| 1998 | 14.5°C | 9.1°C | 3.8°C | 24.9°C | -3.5°C | 114 mm | 83% | 0.1 m/s | 2.1 |
| 1997 | 10.1°C | 5.2°C | 0.4°C | 17.4°C | -6.0°C | 112 mm | 88% | 0.1 m/s | 2.4 |
| 1996 | 12.0°C | 6.8°C | 1.5°C | 21.6°C | -7.1°C | 94 mm | 84% | 0.1 m/s | 2.4 |
| 1995 | 9.4°C | 4.4°C | -0.6°C | 19.4°C | -9.1°C | 87 mm | 82% | 0.1 m/s | 2.5 |
| 1994 | 12.3°C | 7.4°C | 2.4°C | 19.6°C | -4.5°C | 74 mm | 86% | 0.1 m/s | 2.2 |
| 1993 | 9.8°C | 5.1°C | 0.3°C | 18.1°C | -6.2°C | 93 mm | 84% | 0.1 m/s | 2.4 |
| 1992 | 9.6°C | 5.4°C | 1.1°C | 17.7°C | -4.7°C | 161 mm | 89% | 0.1 m/s | 1.9 |
| 1991 | 12.7°C | 7.2°C | 1.6°C | 23.0°C | -6.3°C | 121 mm | 83% | 0.1 m/s | 2.5 |
| 1990 | 13.3°C | 8.0°C | 2.6°C | 21.9°C | -6.9°C | 138 mm | 85% | 0.1 m/s | 2.1 |
| 1989 ❄️ | 6.0°C | 1.1°C | -3.8°C | 16.7°C | -15.3°C | 122 mm | 84% | 0.1 m/s | 2.4 |
| 1988 | 11.2°C | 5.2°C | -0.8°C | 19.6°C | -5.9°C | 57 mm | 83% | 0.1 m/s | 2.6 |
| 1987 | 13.4°C | 7.7°C | 2.1°C | 22.2°C | -5.3°C | 111 mm | 79% | 0.1 m/s | 2.3 |
| 1986 | 9.9°C | 5.1°C | 0.3°C | 18.1°C | -4.7°C | 77 mm | 88% | 0.1 m/s | 2 |
| 1985 | 8.7°C | 3.1°C | -2.5°C | 19.1°C | -11.9°C | 68 mm | 78% | 0.1 m/s | 2.6 |
| 1984 | 15.9°C | 10.3°C | 4.7°C | 22.3°C | -7.7°C | 79 mm | 86% | 0.1 m/s | 2.4 |
| 1983 | 8.4°C | 3.1°C | -2.1°C | 19.7°C | -16.3°C | 255 mm | 83% | 0.1 m/s | — |
| 1982 | 13.0°C | 8.4°C | 3.9°C | 23.0°C | -6.0°C | 177 mm | 88% | 0.1 m/s | — |
| 1981 | 7.2°C | 2.5°C | -2.1°C | 16.0°C | -12.6°C | 140 mm | 82% | 0.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 11.9°C with lows near 1.2°C (mean 6.6°C), based on 45 years of NASA POWER data.
December averages 119 mm of rainfall in Dallas, a relatively wet time of year. The wettest on record was 286 mm in 2015.
The hottest December reached 25.3°C in 2007. The coldest dipped to -16.3°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.8°C. Daytime highs moved from 10.6°C to 14.1°C and overnight lows from 0.4°C to 2.6°C over the same span.
December is one of the cooler months of the year in Dallas and a relatively wet time of year, so plan for around 11.9°C daytime highs and 1.2°C at night.
Not quite — December is the 2nd coolest month in Dallas, averaging 6.6°C.
For December in Dallas, pack warm layers and a jacket for chilly mornings, with typical highs of 11.9°C and lows of 1.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 83% — quite humid.
Average wind speed in December is 0.1 m/s. The windiest December on record averaged 0.2 m/s (2006).
The wettest December on record was 2015 with 286 mm. On average, December sees 119 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Dallas behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
