Forecasters warned that dangerous extra-cold conditions will persist for a huge swath of the U.S. from the Gulf Coast into New England.

Nearly a week after a major snowstorm blanketed the city, many of Philadelphia's narrow streets remain clogged with snow and ice, leaving residents struggling to navigate tight spaces and dig out ...

The cold snap also produced one of Florida's most unusual winter phenomena: cold-stunned iguanas. As temperatures dipped into ...