The weather should be fine. We were there in February a few years ago and it was great then too. Las Vegas is certainly a hot place in July but a decent place in the winter. However, I would not want to live there either. Las Vegas has changed tremendously since the time we went there for our conventions. Too many people and not a safe place to be anymore. At the time we were going you never had to worry about walking anywhere. Crime just didn't happen. Kids were not allowed on the game floors, people dressed to the hilt and great stars and shows to see. Not so much anymore. Everything changes I guess.

Here are some elevation statistics of different parts. Grand Canyon is 7,000 ft. depending where you are so it would be cooler than say Las Vegas. Las Vegas is 2,030 ft. Hoover Dan is 1,232 ft. Henderson, outside of Las Vegas is 2,402 ft. Boulder, outside of Las Vegas is 2,500 ft.

Enjoy your trip.