Vegas is the Mojave Desert so snow is rare and when it happens about every eight years does not last. Our winter weather is cold (50) when the north winds blow but you spend the majority of your time in the casino/hotel. Dress is casual especially in the sports book. Business casual for some restaurants and dressy for clubbing. Most people wear jeans and a nice top, but having a sweater or jacket helps if you get chilly inside the casino.
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You will need a jacket and sweater. It does get cold here even though the sun shines just about every day.
it should be cool in the 60s day30s night