(01 of16)
Open Image ModalA homeless man who wanted to be identified as John, tries to stay warm on a steam grate in Washington. (credit:AP Photo/ Evan Vucci)
(02 of16)
Open Image ModalProject H.O.M.E. Outreach Response Worker Sam Santiago encourages Carl, a homeless man, to come in out of the cold in Philadelphia. (credit:AP Photo/Matt Rourke)
(03 of16)
Open Image ModalPrince, who is homeless, sits on a subway grate to keep warm on a frigid day in New York. (credit:Photo by Spencer Platt/Getty Images)
(04 of16)
Open Image ModalA homeless man steels himself against single-digit temperatures with blankets and a jet of warm air coming up from the McPhearson Square Metro station beneath the Department of Veterans Affairs in Washington. (credit:Chip Somodevilla/Getty Images)
(05 of16)
Open Image ModalA homeless man bundled against the cold walks at McPherson Square as temperatures dipped into the single digits Fahrenheit and minus degrees with the wind chill in Washington. (credit:Getty Images)
(06 of16)
Open Image ModalHomeless men try to get sleep at a Metro station entrance in Washington. (credit:Getty Images)
(07 of16)
Open Image ModalA woman bundled against the cold walks past a homeless man in McPherson Square, Washington. (credit:Getty Images)
(08 of16)
Open Image ModalA homeless man bundled against the cold, tries to get some sleep at the Metro station in Washington. (credit:KAREN BLEIER/AFP/Getty Images)
(09 of16)
Open Image ModalA homeless man goes through the trash as temperatures dipped into the single digits in Washington. (credit:KAREN BLEIER/AFP/Getty Images)
(10 of16)
Open Image ModalProject H.O.M.E. Outreach Response Worker Sam Santiago, right, encourages Ramon Perez of Mexico who is homeless, to come in out of the cold in Philadelphia. (credit:AP Photo/Matt Rourke)
(11 of16)
Open Image ModalMichael Best, right, and others who identified themselves as homeless, use donated wood and a fire barrel to keep warm in Knoxville. (credit:AP Photo/Knoxville News Sentinel, Michael Patrick)
(12 of16)
Open Image ModalNicholas Simmons, 20, of Greece, N.Y., left, warms himself on a steam grate with three homeless men by the Federal Trade Commission, just blocks from the Capitol, during frigid temperatures in Washington. (credit:AP Photo/Jacquelyn Martin)
(13 of16)
Open Image ModalSimmons disappeared from his parents house in a small upstate New York town, leaving behind his wallet, cellphone and everything else. Four days later, an Associated Press photographer, looking for a way to illustrate unusually cold weather, took his picture as he warmed himself on a steam grate. (credit:AP Photo/Jacquelyn Martin)
(14 of16)
Open Image ModalFour homeless men warm themselves on a steam grate by the Federal Trade Commission. (credit:AP Photo/Jacquelyn Martin)
(15 of16)
Open Image ModalNick warms himself on a steam grate with three other homeless men. (credit:AP Photo/Jacquelyn Martin)
(16 of16)
Open Image ModalVictoria Morris, 28, panhandles in Portland, Maine, where the temperature at dusk was 7 degrees Fahrenheit. Morris, who is homeless, decided to seek shelter when she could no longer feel her toes. (credit:AP Photo/Robert F. Bukaty)