According to the clock here, summer officially started just a few minutes ago when the sun reversed its northbound travel (as seen from Earth) and will be heading southward again with the days getting shorter. June 20th daylight hours/minutes is 14:25, the longest day of the year.
Once again, I borrowed the screenshot graphic from Archaeoastronomy.com showing the frame from the animation where Earth passes through the summer solstice point in its orbit. The graphic shows the four seasonal starting points along with the four cross-quarter points of ancient significance.
Our summer weather is already here with yesterday and today’s highs above normal, hitting 116 yesterday and probably close to that again today. Damsel and I are cool and comfy inside our beautiful air conditioned territorial cottage.