Answer:
Butane burns at no less than 450 Celsius.
But it might actually be higher.
See related link.
the hotter something is the more the molecules in it bounce around. This bouncing around makes it so that molecules are more spread out in hotter air then colder air so the hotter air is less dense and the less dense air rises above the colder more dense air.
Answer:
Assuming good mixing and proper flow conditions a butane/air flame (like a lighter) can reach temperature of 1,977o C