Well you guys are going to hate me and for two reasons,
1/ I have to disagree in a way
2/ I'm Canadian and we beat you in hockey
LOL
Fella's Here in this part of Ontario I have seen the population drop bad in the last 4-5 years. A couple of issues here that I see every year now is
1/ Snow fall , we are in a lake effect area and see around the 4 feet at times with maybe a 2.5 feet on the level in a good winter. The only food sorces are used up early as this starts in the 2nd week of December every year and runs til April.
2/ Predator population is way out of control, Coyotes , Raccoons, Skunks are all over and nests take a beating every spring.
3/ Hatch rates are down every year for the last 5 here and now the impact on the population has shown its self bad as I hardly see birds in my area over the winter.
So I would have to say yes snow falls will do harm to them if it is deep and stays real long...