The average high temperature in Las Vegas ranges from the upper 50s to near 60 degrees during December. This means you will want to bring pants or a skirt, as temperatures can be a little chilly for shorts at that time of the year. Long-sleeve shirts and blouses will help keep you warm while outdoors, but if you enjoy the cooler temperatures, short sleeves can still be worn during the day.
The average daily low is in the upper 30s in early December and the mid-30s toward the end of the month. This means that along with long pants and long sleeves, you are going to want to pack a jacket for walking outdoors at night. A hat and gloves should be packed to prepare for those chilly nights, especially considering that the temperature can drop below 32 on December evenings when colder-than-average air masses invade the area.
Weather in Las Vegas in December can turn wet at times. The Las Vegas Weather website indicates that in 2008, Las Vegas had its highest one-day recorded snowfall of 3.6 inches. To prepare for the rain and snow, be sure to pack an umbrella. Considering heavy snow is not common in Las Vegas, boots are not necessary, but a warm pair of waterproof shoes can help keep you comfortable.
Don't forget that you can escape the elements of Las Vegas weather by remaining in your hotel during the day. Some hotels in Las Vegas feature indoor heated pools. Prepare for this opportunity by packing a few swimsuits for swimming or shorts for relaxing by the pool.
