Houston Weather in December
Houston, Texas basks in balmy weather during December. Despite it being winter, the days are warm and often sunny.
This page gives detailed information on the typical December temperature, precipitation, sun, humidity, wind and storms for Houston. The numbers here are historical averages based on temperature and rainfall measurements gathered at Houston Hobby Airport and other climate data from George Bush Intercontinental Airport.
Temperature
| 66 °F | December average high | 19 °C |
| 48 °F | December average low | 9 °C |
| 22 days | 60 °F max. or more (16 °C) |
| 8 days | 40 °F min. or less (4 °C) |
Nearly every December day warms to over 50 degrees Fahrenheit (10 degrees Celsius) in Houston. The city averages 13 days this month when the thermometer reaches into the 70s °F (over 21 °C). Typically two days in December heat up into the 80s F (above 27 °C).
The thermometer dips to freezing or below on an average of 1 night this month.
Precipitation
| 4.3 in | total precipitation | 110 mm |
| 10 days | of rain |
Half the time, Houston receives 2.7 to 6.1 inches (69 to 155 mm) of rainfall in December. One in four years has drier weather, while another one in four is wetter. In rare years, some of the precipitation falls as snow.
Sun
| 51 % | sunshine |
| 7 days | clear skies |
The sun's rays reach the ground in Houston during 51 percent of daylight hours on average in December, for a total of 162 hours in the month. Typically on 7 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in December at Houston averages 10 hours and 16 minutes a day. The shortest days of the year, from around December 17th to 24th, last 10 hours and 14 minutes from sunrise to sunset.
Humidity
| 76 % | December average humidity |
The relative humidity in Houston during December usually peaks at 87 percent in the morning then drops to 57 percent by mid afternoon.
| Local Time | 12 am | 3 am | 6 am | 9 am | 12 pm | 3 pm | 6 pm | 9 pm |
| Humidity % | 84 | 86 | 87 | 80 | 62 | 57 | 71 | 80 |
Wind
| 7.7 mph | December wind speed average | 12.4 kph |
December is an average month for wind speed at Houston.
Storms
| 3 days | rainfall of 0.5 inches (13 mm) or more |
| 2 days | with thunderstorms in December |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.