>even though one might have expected them to be clustered more, and
consuming
less stores.

I recall that 50ºF (10ºC) has been given as the optimum temperature for
minimal food use - lower temperatures need more food to generate heat,
whereas higher results in more activity.  I suspect that this depends on the
race as we often have bees flying at 5ºC.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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