This is our 5th year of beekeeping. We had a very dry summer. Three weeks ago I harvested honey. There wasnít as much honey as in past years. I started feeding Sugar water right away and today I was installing my metal guards to keep the mice out and noticed a couple of my hives seemed dead. The coldest its been so far is 28 degrees. It was 45 this morning so I popped the top off one of the hives and there were lots of dead bees on the bottom screen and two small clumps of dead bees. There was however a larger clump that were still active. Any idea whatís going on? I looked into the bottom of the other hive and saw lots of dead bees but didnít pop the top on that one. I have 6 hives and the others seem ok.