Sunlight streams through the windows of a burned-out building in Plattsmouth, Nebraska. Photograph: Nati Harnik/APIcicles form on a fountain in Augusta, Georgia. Photograph: Michael Holahan/ZUMA Press/CorbisIce forms on the US side of the Niagara Falls. Photograph: Aaron Harris/ReutersFrozen mist from Niagara Falls coats the landscape at Niagara Falls state park. Photograph: James Neiss/APNorth Avenue beach on Lake Michigan is encased in ice as temperatures hit a record low of -16F. Photograph: Scott Olson/Getty ImagesFrost covers the pierhead at Grand Haven, Michigan. Photograph: Barcroft MediaIcy crystals gather on top of a frozen pond in Lawrenceburg, Kentucky. Photograph: Luke Sharrett/Getty ImagesOranges encased in ice after an overnight frost at Bellamy Grove, Inverness in Florida. Photograph: Matthew Beck/APJennifer Berry watches the sunset from a lifeguard chair over a frozen Lake Calhoun, Minneapolis. Photograph: Eric Miller/ReutersChicago and Lake Michigan as viewed from a plane. Photograph: Shawn Reynolds/https://twitter.com/WCL_ShawnThe Chicago skyline framed by icicles in Illinois. Photograph: Jim Young/ReutersSprinklers left on overnight coated plants in ice in Panama City beach, Florida. Photograph: Andrew Wardlow/AP