Las Vegas Weather in December
December's weather is the coolest of the year for Las Vegas, Nevada. But that only means a few nights of frost and daytime temperatures in the 50s Fahrenheit (over 10 degrees Celsius).
This page gives detailed information on the typical December temperature, precipitation, sun, humidity, wind and storms for Las Vegas. The numbers here are historical averages based on climate data gathered at the McCarran International Airport, located near the south end of the Las Vegas Strip.
Temperature
| 57 °F | December average high | 14 °C |
| 40 °F | December average low | 4 °C |
December is the coldest month overall for Las Vegas and the 19th to 25th are its chilliest days. That is when the daily high averages 56 degrees Fahrenheit (13 degrees Celsius) while the low is 39 °F (4 °C).
| 28 days | 50 °F max. or more (10 °C) |
| 19 days | 40 °F min. or less (4 °C) |
Every December day warms to over 40 °F (4 °C) in Las Vegas. The city averages 11 days this month when the thermometer reaches into the 60s °F (over 15 °C). Temperatures above 70 °F (21 °C) occur during December once every few years.
December brings the first frosts of winter to Las Vegas. The thermometer dips to 32 °F (0 °C) or below on an average of 5 nights.
Rain
| 0.5 in | total precipitation | 11 mm |
| 3 days | of rain |
Most years, Las Vegas gets less than 0.8 inches (19 mm) of rain in December. Every three or four years, the city receives no rain or snow at all this month. About once a decade, it snows in December.
Sun
| 78 % | sunshine |
| 15 days | clear skies |
The sun's rays reach the ground in Las Vegas during 78 percent of daylight hours on average in December, for a total of 236 hours in the month. Typically on 15 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in December at Las Vegas lasts for 9 hours and 44 minutes a day on average. The shortest days of the year, from around December 17th to 24th, last 9 hours and 42 minutes from sunrise to sunset.
Humidity
| 45 % | December average humidity |
The relative humidity in Las Vegas during December usually peaks at 57 percent in the morning then drops to 32 percent by early afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm |
| Humidity % | 52 | 55 | 57 | 40 | 32 | 32 | 44 | 49 |
Wind
| 7.3 mph | December wind speed average | 11.7 kph |
December has the calmest wind on average for Las Vegas.
Storms
| 1 day | rainfall of 0.1 inches (2.5 mm) or more |
| 0 days | with thunderstorms in December |
About once a decade, Las Vegas receives over an inch (25 mm) of rain in one day during 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.