Summer arrives June 21, at 11:16 am MDT when the direct rays of the Sun will reach the Tropic of Cancer. This marks the Summer Solstice...the official first day of Summer for the Northern Hemisphere.
This also marks the period of the year when the days are longest. In Grand Junction, the Sun will rise at 5:48 am MDT and will set at 8:43 pm MDT. This relates to 14 hours and 54 minutes of daylight.
Grand Junction June 21th statistics:
Average high temperature: 89°
Average low temperature: 57°