Yup…ice slows warming. It sucks up a lot of heat trying to phase change. Keep losing all of that year to year up there (permafrost, glaciers, sea ice) and all of thermal energy goes into warming instead of melting. Our Canadian source region gets hotter and warmer earlier and now it’s practically cut off for weeks or over a month at a time in the heart of summer. Just some impotent fronts that give us dew downs or ooze in from the NE via a BD.