This post provides details about what kind of weather to expect in Las Vegas during December. You can look forward to mostly dry and sunny weather with cool afternoons and cold nights.
Daytime high temperatures early in December tend to be near 60F (15-16C) but will fall to the mid to upper 50s F (13-14 C) later in the month.
A few of the warmer afternoons, especially early in the month, can reach up into the upper 60s F (20-21 C). The record high temperature in Las Vegas during December is 77 F (25 C).
Late night and early morning low temperatures will generally be in the low 40s F (4-5 C) early in the month falling to the mid to upper 30s F (2-3 C) near the end of the month.
A few of the colder mornings, however, can dip down into the upper 20s F to near 30 F (-2 to -1 C), especially near the end of the month.
You can expect 8 days with late night or early morning lows dipping to 32F/0C or less. The record low temperature in Las Vegas during December is 11 F (-11.7C).
Clouds and Rain
Skies tend to be clear, or at least partly sunny, on about 22 days this month. Some precipitation can be expected on about 3 days, however, significant rainfalls of at least 0.5 inches (13 mm) occur only once every 3-4 years.
Snow can fall in Las Vegas during December, however, snow only occurs about once every 5 years with snowfalls of 3 inches or more, only once every 10 years.
Daylight and Windspeed
About 9.9 hours of daylight occurs on December 1st with the shortest day being December 20th with 9.7 hours of daylight.
During December the wind in Las Vegas tends to be light to gentle at 4-12 mph/6-19 kph but briefly can be moderate 13-18 mph / 20-28 kph.