Finches and other winter birds are missing from the foothills?

[Pat Ledlie]

I'm in Buckfield in the foothills of the Western Mountains.  We had many Purple Finches and Goldfinches  at our feeder early on, but for the last two months or so it's been Blue Jays, Tufted  Titmice, Black Capped Chickadees , and for a couple of weeks 2 lone Tree Sparrows.  Must be something to do with weather patterns?  Any ideas?