The Geminids are one of two showers known to be associated with an asteroid instead of a comet - the asteroid in this case is 3200 Phaethon.
The radiant is near Castor, so when it rises in the late evening is the time to start watching.
Rates gradually build up the maximum around 13th and 14th but then drop off rapidly afterwards. And because the radiant is is relatively low to southern Australian observers don't expect the 120 ZHR that the northern hemisphere gets, perhaps around 60 per hour is more realistic, but its still one of the better showers for us to observe.
