Often people will use “then” in places where they need “than”.
Incorrect: The girl in red is taller then the girl in blue.
Correct: The girl in red is taller than the girl in blue.
It’s a comparison, like “stranger than”, “more than you would think”, or “colder than”.
Side note: Winnipeg, where I am, was colder than Mars on December 31, 2013. It was -38°C (-48 with the windchill factor!) More…