HARROW: Boston still hasn’t seen 60 degrees this year, but last week, Antarctica did. The temperature on the northern tip of a peninsula on the continent soared to 63.5 degrees, potentially breaking Antarctica’s all-time heat record. An Argentine research station recorded the preliminary temperature reading last Tuesday, according to the UN’s World Meteorological Organization. The Web-based weather service Weather Underground, which first wrote about the potential record, said in a post that the warmest known temperature on Antarctica before last week was 62.8 degrees, which was recorded at the same base in 1961. Compare that with Boston’s temperature last Tuesday, which topped out in the mid-30s. The WMO is evaluating whether the temperature recording in fact set a new all-time heat record, a process that usually takes four to six months. The high temperatures in Antarctica were “partly the result of an El Nino event that we have in the Pacific Ocean right now, and that’s kind of messing up the weather patterns around the world,” said Dr. Randy Cerveny, an Arizona State University professor who works with the WMO.