copied this from 1 report of our winter..
One explanation for the warmer than normal season is the Arctic Oscillation (AO), which has two phases.
"A 'positive' phase is where the jet stream flows strong and far to the north thus "trapping" cold Arctic air near the pole," explains Cool. "And a second 'negative' phase results in a jet stream track much further south. This second pattern essentially opens the freezer door and allows the cold air from the north to spill southwards."
Within the last couple of weeks, the Arctic Oscillation dipped back into a negative phase, so what's in store for the rest of February?
"According to the computer model predictions, there seems to be an agreement that we're heading back to positive territory...It seems clear that warm conditions are set to return, at least for the third week of February," says Cool.
He warns that the lack of snowfall so far this winter however, is not guaranteed to continue.
"Significant later winter and early spring active weather is not uncommon, so don't be ready to write this winter off just yet."