Morgan Parrish

The coldest day of winter so far in Philadelphia, with bitter temperatures and wind chills making even short trips outside risky.

Despite the cold, some walkers, joggers, and runners still push through the conditions, bundling up and braving the freeze.

The dangerous cold isn't just uncomfortable.

Doctors warn frostbite can develop in as little as 20 minutes, with the risk of losing fingers, toes, or ears.

Hypothermia is also a major concern.

Doctors and city officials remind residents to limit time outside, stay indoors where it's warm, and make sure heating systems are working properly as this dangerous cold continues.

Reporting in Philadelphia, Morgan Parrish, Fox News.

The coldest day of winter so far in Philadelphia, with bitter temperatures and wind chills making even short trips outside risky.

Despite the cold, some walkers, joggers, and runners still push through the conditions, bundling up and braving the freeze.

The dangerous cold isn't just uncomfortable.

Doctors warn frostbite can develop in as little as 20 minutes.

with the risk of losing fingers, toes, or ears.

Hypothermia is also a major concern.

Doctors and city officials remind residents to limit time outside, stay indoors where it's warm, and make sure heating systems are working properly as this dangerous cold continues.

Reporting in Philadelphia, Morgan Parrish, Fox News.