Most of the year, I don't see dark eyed juncos near my house in the Boston area. This may sound odd, but as soon as it starts snowing, they show up! We have had almost no snow this year, but around noon today it started. And what did I just spot outside by the seed dish? Yup... about 4 juncos AND a small group of different sparrows than usual.
Obviously these birds were in the area this morning, but where do they hang out so they don't get seen, and why do they only come out when the weather is bad???