There are a few different phrases you can use to describe cold weather in Engpsh:
"It's freezing outside!" - This means that it is very cold outside.
"It's bitter cold." - This means that it is extremely cold and uncomfortable.
"It's a cold day." - This means that it is cold outside, but not necessarily extremely cold.
"It's below freezing." - This means that the temperature is below the freezing point (32 degrees Fahrenheit or 0 degrees Celsius).
"It's a nippy day." - This means that it is cold, but not too cold.
"It's chilly outside." - This means that it is cool, but not necessarily cold.