I'm located in upstate NY in zone 4. Cold climate, although we've had a relatively mild winter. Past few days temps have been in the low 30's and today so far is upper 20's. Checked on my one small hive (1 shallow, 1 deep) and the bees are all clustered on the top of the frames of the upper super just under the inner cover (some are on the top of the inner cover). Their supplies in the upper super are adequate. This is my first winter and I'm a bit confused by this behavior.