Yes a blue sky day without wind would be very nice please!!
I've done a long weekend winter Munro's trip for the last 5 years. Of the 20 odd mts I've "bagged" on those trips I've not seen blue sky at the top of any of them.
Last year was close..... 3/4 of the way up Ben Lawers, blue sky and sunshine......but sods law... the howling gale made it impossible to get to the top.