Don Torres, in Ellicott City, tracks the planet’s cold spots on our print weather page: “It’s almost always Summit Station, Greenland, and … [in the southern winter] Islas Orcadas… Would you identify these locations?” Sure. Summit Stationis a university research outpost in the center of Greenland. Islas Orcadas is the Spanish name for the South Orkney Islands. By treaty, the islands are part of Antarctica. Both the U.K. and Argentina have research bases there.