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The weather varies greatly throughout the year in Las Vegas â the winter months are dry and cold with short days and long nights, whilst the summer months are blisteringly hot with long days and short nights. Las Vegas is located in Nevada in the Mojave Desert.
The air in Las Vegas is most often at its driest around July 8th, when the relative humidity falls below 16% (dry) three days out of every four, whilst the most humid day of the month tends to be July 31st, when it rises above 28% (dry) three days out of every four.