http://finance.yahoo.com/news/irans-oil-boom-fizzles-070010604.html
I haven't yet found a reasonable data source to show the effect of Ramadan on output of OPEC member states that have Islamic holidays (all I would assume).
anyways - if the above if not a "short term" effect, it will be positive for supply-demand dynamics, and hence prices.
rgds
V_H