Even If it said, this winter is looking to be an unpresidented 7 C below average, I would treat it with the same level of caution.
The smallest variation on any given situation can have wide variations on the weather in this country, E.g a high pressure just 100 miles out of position dertimaineing (typo ) between mild and a minus 14 frost!!
The likes of la Ninia etc can still have un predicted small changes without warning, swaying one weather type on the other side of the world to another.
I think it would be wise, certanly here in the U.K to go through our winters on a more Hand to mouth basis rather than get upset when some longer range forecast doesn't quite go to plan!