Summer Solstice 2017 began yesterday, June 20 or today, June 21 depending on your time zone in the Northern Hemisphere. It marks the 1st day of summer and also the longest day of the year. In the Southern Hemisphere, it's the winter solstice.
Go out and catch some rays as summer solstice is the day containing the most hours of sunlight during the year. But, if you're living in Iceland and Norway you will have continuous daylight this time of year.
Timing of the solstice isn't based on a specific calendar and date, but is dependent on when the sun reaches its northernmost point from the equator.
Solstice derives from the Latin solstitium combining sol (sun) and stitium (to stop) reflecting the fact that the sun looks like its stopped at this time, and again at the winter solstice around December 21.
We'll be spending some time outdoors today. Here in Nashua, NH, the forecast is for daytime highs in the mid-80s, unlike the dangerously high temperatures in many Southwestern U.S. states.