Thanks nytraveler for your suggestion. It was only a possibility that I told you.But you were right because I did not pay attention towards the weather condition there. Thanks for making me understand.

But it is sure that I will go to USA in up coming days.

The one advantage of traveling in March is that you should more easily find accommodations.

And as for Las Vegas in March - that's a great time to go. Average of 70 degrees - nice but not too hot - and yes, the pools should be open.

http://govegas.about.com/od/weather/a/Weathermarlv.htm