Hace frio means its cold like as in weather.

A cold front is the transition zone were a cold air mass replaces a warm air mass. A warm front is a transition zone were a warm air mass replaces a cold air mass.

I recently heard that the Inuit have many words for "cold". Apparently one of them directly translated means "three dog cold". So a three dog night would be a really cold one!

Ada, played by Nicole Kidman, is the heroine of "Cold Mountain".

My cat wants inside when he gets cold. If its below 40 he will get in.