we have it every year, or at least with enough dependability that we have a thing called "january thaw".
in my early years i lived in places where one hardly noticed the thaw, and spring was on its way, anyway, but here winter is just getting going even though we have a beastly week with wam temperatures that messes up our snowpack.
put it in a massive pile and it will stay longer.
and that's how snohaus is built. later on when there is more snow to work with, i have a large base on which to build.