jeff has some good thoughts. warming the hive, this can be accomplished a couple different ways.
warm syrup, but directly on the frames not above the inner cover. the inner cover is a barrier.
zweef, they starved. couple questions, the syrup can, did it still contain syrup? and how much? how many dead bees were on the bottom of the cage, normal amounts? also curious, why only a 2 lb package?
did you hive in a single deep in your field?
bees need their honey stomachs full to generate heat in the cluster.
we got hit really hard (zweef is not far from me) with the absolute craziest winter storm in april i have ever seen in wisconsin. i know you didn't have the choice to sit on the packages for a couple days, because the weather from thursday through sunday was incredible, and it was still snowing and cold on monday. we had driving rain, sleet, hail and blizzard conditions and high winds that knocked down mature trees and took out power lines. some parts of ellsworth were still without power wednesday. not to mention how cold it did get. felt like january.
you did good, you did the best you could. just a couple thoughts.
i have hived many packages in inclement weather. knowing what we had coming i think i would have changed up what i traditionally do.
one is to move the single deep to a very protected area or warmer area, like the garage or up against the house.
remove 4 frames from the center, take them in the house, the honey and/or frames you fill the 1:1 on. let them warm up. put the whole package in for a couple hours. go back, take some really warm syrup with you and VERY LIGHTLY SPRAY the bees, dump in quickly and as you did, release the queen, put the 4 frames back in, close it up.
sugar syrup for you, too cold, they couldn't utilize it, just my HO. it's above the inner cover, and i don't know if it would have made a difference putting syrup directly on top the frames, it was too cold in our weather for them to take it down. too cold to open a hive to change out syrup on a package. throwing sugar on or better yet a sugar cake directly on top the frames may have helped, hard to say zweefer.
i am sorry you lost these packages and your hives. this is tough. you have been through a great deal and this does not really encourage anyone to keep on keeping bees, but don't give up!
when you have the heart and it's not freezing cold or snowing here, please post an update as to what you found.
hang in there!
to spray or not to spray: warmed 1:1 about 80 df, no cold spray on them.