It's too cold today X
It's so cold today O (사실은 이때 so 쓰는 거 원

래 안 맞는데 모두 사람 이렇게 써요 ㅎ)

Too ~ = ~하기에/위에

It's too cold to go outside.

A: Do you want to go outside?
B: No. It's too cold (to go outside).