Rubikscube, it's a work in progress, part of my anticipated steep learning curve since joining the forum on August 17th. In that way, the yearly average one replaces the previous, as the 365 day mean is IMO what we need to look out for. When it shifts again, it will be very dramatic for the remaining ice.
Also, I try to be strict about what is relevant for the melting season and not. The 365 Day Mean is sort of an "anti-season" project from the bottom up, removing the seasons altogether!