They're still grouped up pretty good around here (Calhoun Co.). My buddy saw 40 yesterday in a group and I saw about 15 together tonight coming home from work.
Not much changes about their behavior in the snow except the roost. As Scott noted they prefer tall pines for shelter- but that's the case all winter anyway. They'll start using deciduous trees once they leaf out.
"The joy of living is his, who has the heart to demand it." Teddy Roosevelt