botanical garden - a facility where trees and shrubs are cultivated for exhibition. arboretum. facility, installation - a building or place that provides a particular service or is used for a particular industry; the assembly plant is an enormous facility.
Keystone, CO Weather. The average temperature of Keystone is 35.80Â°F, which is much lower than the Colorado average temperature of 46.26Â°F and is much lower than the national average temperature of 54.45Â°F. Historical Weather.
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.