The Hoth scenes were shot in Finse, Norway. I visited at the end of April, beginning of May 2010. The lake was still frozen and there was plenty of snow. The cold climate is much due to the altitude, it being in the mountains. At the same time it was full spring in Norway's capital at sea level, with almost summer temperatures - I know because I visited there right before and after Finse. According to the location manager in Finse, Norway, it was chosen for its proximity to England and the ability to transport props and set pieces there. Train ride from Elstree to the coast + ferry + direct train.