How cold does it have to be to close school in Philadelphia?

Answer 1

Usually, there are no set temperatures for schools to close. Temperatures and other factors are considered in making a decision to close them. If it is determined that students' safety would be compromised due to the weather, the schools will be closed.

For weather related closings:

The best source of information for school closings in the United States is usually the local T.V. and radio stations. Radio stations almost always announce the list of closings they receive every few minutes. Television stations usually run an ongoing list of closings across the bottom of the screen or show the list every few minutes. Closings might also be posted on their websites and possibly on the school district's or individual school's websites.