To elaborate on what Arbilab said, global warming is pushing the west-to-east airflow further north before it comes back down over Hudson Bay to us here in the north east. Because the air has gone further north than usual, it's colder than usual when it hits us.
If I understand correctly, Quebec, the Maritimes, and the northeastern U.S. states comprise one of the few areas in the world that is supposed to get an INCREASE in precipitation. we're also supposed to get more temperature swings.
This is just my subjective opinion, but it seems like the TIMING of the seasons is changing. Compared to the first 20 or so years of my life, NOW it seems summer continues further into September, if not October. Then there's an abrupt shift to November-type weather. 'November' lasts until mid-January then all of a sudden there's a deep freeze that continues well into March. Then within 2 weeks we've got late-April weather.
Three weeks ago I was still wearing my heaviest coat. Now it's mid-April and I haven't worn anything more than a sweater for a week.....
Jim