A Vulcan lute on Aldea. The Vulcan lute (sometimes referred to as Vulcan harp, Vulcan lyre, or Vulcan Lyrette) was a twelve-stringed instrument, played on the planet Vulcan, that was tuned on a diatonic scale and noted to be very soothing.
Keystone Average Weather. 1  The highest monthly average temperature in Keystone for July is 54 degrees. 2  The lowest monthly average temperature in Keystone for December is 14 degrees.  The most monthly precipitation in Keystone occurs in January with 0 inches.
Keystone offers a year-round summer school alternative. Over 40 courses are available to students in grades 6 through 12, so students can master English, math, social studies, science, and Spanish, earn passing grades, and graduate on time with their classmates. Credit recovery course materials are available in online and correspondence formats.