Regardless of my opinion, it seems that Mother Nature is in agreement with them and the plants are providing both pollen and propolis. There is however one difference from summer foraging and that is they greatly shorten the window of foraging time to the best daylight house of the day from 10-2PM.
If a picture is worth a 1000 words well here are a couple video clips to give you a better picture of how busy they still are. These were taken around 11AM on 11/26/2012 and the temp was reading 42F.
As you can see there is some light yellow and whitish pollen coming in. So where are they finding all this pollen? Here are are a few places I found on a walk around the neighborhood:
Wow with all those flowers you might think Seattle was a topical oasis, but it is not and you just have to look at all the bare trees to know that it is indeed winter. Perhaps the plants here are just thick skinned not too unlike the bees.
Back to the bees.