Weather phenomenon called WAO to blame
If she did she would discover that there exists a phenomenon called the North Atlantic Oscillation (NAO).
The NAO is the dominant mode of winter climate variability in the North Atlantic region, ranging from central North America to Europe and much into Northern Asia. The NAO is a large-scale seesaw in atmospheric mass between the subtropical high and the polar low. The corresponding index varies from year to year, but also exhibits a tendency to remain in one phase for intervals lasting several years.
