I think one of the issues with snow taking time to settle and subsequently thawing even overnight is that the ground temperature simply isn't low enough. We probably needed a few hard/severe frosts first.
Vile dull morning with sporadic light wet snow/sleet and very cold in the wind, 1.4c currently.
3 days out of 4 with wintry precipitation which is positive seeing as it's only 11th December.