Cold weather linked to 40,000 extra heart deaths each year in the U.S.

When temperatures plunge, the risk to your heart rises dramatically. A large U.S. study shows cold weather is linked to far more cardiovascular deaths than heat, accounting for tens of thousands of extra deaths each year. Scientists found the safest temperature sits around 74F, with danger increasing as conditions get colder-or hotter. As more people live with chronic illnesses, the threat from extreme cold may only intensify.