Only been to Sun Valley once, last year in February. But no worries about rain, bad weather, airport closings, etc. then. Historically and interestingly, the original decision to build Sun Valley was consideration of scenery and good weather -- not quantity of snow. It's got the lowest avg. snowfall and biggest snowmaking apparatus of almost any resort west of the Mississippi. As the local cliche goes, "they call it Sun Valley, not Snow Valley, for a reason."