I live in Nova Scotia in Canada. They are forecasting highs of 5-8 c for the next week or two with lows just a few degrees below zero http://www.theweathernetwork.com/weather/CANS0142 . I was thinking about putting sugar water back on to them today or in the near future.
The girls have been out and flying a few times in the last week. I just saw 3 of them in a few minutes on my deck about 100-150 feet from the hives.
I don't mind pulling them apart to see what they have for reserves, but figured just slaping sugar water on top would be a lot less invasive at this time of year.