Here are some data on colony size in UK
SUMMARY
Mean adult bee populations were 18 000 in late May, 37 000 in early June and 13 000 in late September, while mean brood populations were 15 000 in late May, 24 000 in mid-June and almost non-existent in late September.
McLELLAN (1978) GROWTH AND DECLINE OF HONEYBEE COLONIES AND INTER-RELATIONSHIPS OF ADULT BEES, BROOD, HONEY AND POLLEN. Journal of Applied Ecology, 15, 155-161
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