Christmas Calendula

I do not recall, in the decade or so that I've been farming, Calendula ever before blooming still on Christmas day. But Christmas has come and gone and we still have some rugged Calendula stubbornly putting out blooms. Of course, with the changing weather patterns maybe this is a new occurence. Maybe things in central New York are no longer as rugged as they once were. So, now, the new norm - Christmas Calendula?