Frequency of appointments with Ph.D. supervisor
The frequency that students and advisors meet depends a lot on the particular student and advisor, and also varies highly by time.  In my experience, once a month is quite a bit on the low side, but not unusually so.  A more typical pacing is once a week or once every two weeks.  

The reason for this frequency is not for the sake of "norms", but rather is a good spacing for giving enough time for the student to accomplish something but not so much so that the student is likely to end up wasting a lot of time or becoming very frustrated going down a bad path that the advisor might have been able to detect and help remedy.

If your advisor is meeting with you once a month and happy with your progress, then perhaps you are simply doing very well at self-direction.  It is quite reasonable, however, to ask for more frequent supervision if you think that you will benefit, and as a new Ph.D. student, I think that you likely should do so.