I am working on a school project about futures contract. At this point, I am curious what some indicators or factors that affect the price of natural gas are.

Currently, I have compiled the following that affect price:

1) weather
2) natural gas production
3) rig counts
4) LNG market
5) NG-based powerplant
6) economic conditions in Qatar or Iran

Am I thinking in the right direction? What kind of other factors should I look for?