Winter Wonderland

It seems that the whole country has been gripped by an early winter,with amazingly low temperatures, snow and ice. The country looks beautiful but has bought an added worry about the effect of the snow on the bees.
The temperature by the hive at around 10 am was -1C, the hive covered with snow, but the entrance was clear and astonishingly a bee flew out while we were there. I'm not sure whether to worry about that or not!!