Barometric pressure swing

Anyone knows why the barometric pressure has a much larger swing in
Pacific Northwest (Seattle) than in New Jersey area? I remember back
in the days when I was flying in NYC area a low pressure day would have
an altermeter setting of something like 2980, and a high pressue day
would be something like 3006. Here in Seattle the altimeter setting
can go from 2940 to 3050 in about two days when a strong system passes.

Is it because of the higher latitude (48 north in Seattle vs. 40 north
in Jersey) or is it because the storms in northeastern Pacific being a
lot more severe? Temperature wise Seattle is very mild compared with
the northeast.