I know last year, it was such a warm winter, bees swarmed earlier... mine did on March 17th. This year we just started having temps in the lower 50's, upper 40's in the last 2 weeks. I am still seeing drones, and my bees are coming out feeding at 46 degrees....and drinking water out of the black bedliner of my truck. Now I have seen a few workers trying to throw some drones out a couple of weeks ago, but not lately. I know I have a mite problem, I have been seeing a few bees with deformed wings, workers tossing them out of the hive. I even found a few white larva that had been thrown out of the hive, the eye just starting to turn color. I thought the queen wouldn't be laying this time of year?