OK, seriously, Paus gave good answer. However if you have to collect the bees soon and cannot wait for spring then consider mid day. The older, grumpy foragers will be in the field during mid day so at least some of the meaner bees will not be in the hive.
Cool morning will slow the bees down however temps in the 60's is not cool enough to stop the guard bees from attacking you.
Blessings