> I run three deeps - so they have plenty of winter stores.  The situation I 
> ran into this past winter was that ALL my hives chimneyed up three deeps, 
> leaving lots of stores in the hives.  Combined, there was more than a deep 
> of full frames left in most hives.

I have heard the starvation thing -starvation with stores and a good 
poulation-come up in conversations with other beeks. I speculated   that it 
was a genetic pre-disposition(perhaps "across" races )
I think also the following questions may be irrelevant but should be asked:

What color are the boxes? Dark colors will warm much much  more 
rapidly-especially up North with the low sun.
Are the hives in the shade?

I am not knowlegeable about beekeeping up North at all, but it just seems to 
me that this is a problem that would have been bumped into before

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