Are you looking for a short vacation getaway this month?  Maybe someplace that is just a little bit warmer?  The area around Carlsbad has long been a cool weather destination for savvy New Mexico travelers.    At 3300 feet of elevation and in the far southeastern corner of the state, the average high/low temperatures for the middle of March are a pleasant 71 and 41 degrees. Carlsbad Caverns imme…