Oh…. so that's why there are so many house fires in the winter from people using space heaters… or from people putting combustibles too close to the fire place….
or why people tend to build bonfires when it's cold outside.
Science, anon, science.
Heat source(matches, lighter, electricity short),
fuel(the things that will burn: couch, wood, car, etc), and
oxygenare needed for fires.
The temperature outside has nothing to do with it.