The number of bees in the hive will be falling and will soon reach their overwintering numbers. These are known as winter bees. These bees can live for up to six months unlike summer bees with a six week life span.

You will see some dead bees outside the hive entrance but this is normal.  

An external check is all that is needed at this time of year but make sure the hive is weathertight, stable and that the roof is weighted or strapped-down