For what it's worth CF clustering can be very variable. Lot depends on colony size, larger= more heat so less "need" to cluster. Type of hive has a huge influence, bees much less inclined to cluster in poly than wooden with no insulation. Having open mesh floors vs closed makes a big difference.
Of course the obvious major factor is weather conditions where you live.
That said bees are born survivors, even managing to survive when crown boards where propped open with matchsticks to give them a nice through icy draft all winter. Hope no-one still practises this archaic wintering "technique".
Just make sure they have plenty of stores.....although even this can catch you out. The hive I've just added fondant to had well over 10 litres of thick syrup late Sept/Oct......seems they converted it into bees rather than stores....must have some Italian blood....
Of course the obvious major factor is weather conditions where you live.
That said bees are born survivors, even managing to survive when crown boards where propped open with matchsticks to give them a nice through icy draft all winter. Hope no-one still practises this archaic wintering "technique".
Just make sure they have plenty of stores.....although even this can catch you out. The hive I've just added fondant to had well over 10 litres of thick syrup late Sept/Oct......seems they converted it into bees rather than stores....must have some Italian blood....