To anyone who has experience trading natural gas - there is a contract expiring each month, which contract do you trade? For example, on June 10, would you be trading the June, July, August or September contract? Charts for all of those months show good volume for June 10 (August and September slightly higher) but the price action seemed more pronounced on the September contract opposed to June's. I haven't researched further than this, thought I'd try and consult someone with experience.