Yellowknife and town hall. The first mayor of Yellowknife was Jock McNiven. In September 1967, Yellowknife officially became the capital of the Northwest Territories. This important new status sparked what has been coined as the third boom in Yellowknife. New sub-divisions were established to house an influx of government workers. In 1978 the Soviet nuclear-powered satellite Kosmos 954 crashed to Earth near Yellowknife. There were no known casualties, although a small quantity of radioactive nuclear fuel was released into the environment, and Operation Morning Light—an attempt to retrieve it—was only partially successful. A new mining rush and fourth building boom for
Yellowknife According to Environment Canada, Yellowknife has the sunniest summer in the country, averaging 1,034 hours from June to August. The lowest temperature ever recorded in Yellowknife was on 31 January 1947, and the highest was on 16 July 1989. Yellowknife averages 2256.5 hours of bright sunshine per year or 43.5% of possible daylight hours, ranging from a low of 15.4% in December to a high of 63.0% in June. Due to its warm summer temperatures, Yellowknife is well below the Arctic tree line in stark contrast to areas further east in Canada on similar parallels. In 2014, Environment Canada ranked