Summer Solstice: Summer is officially here with today's solstice
"Welcome, summer! The season officially begins today, the longest day of the year in the Northern Hemisphere.
Though the actual length of the 24-hour day doesn't change, daylight will last a fraction of a second longer on June 20 than on June 19 or 21. From here on out, the days will get just a bit shorter each day until the winter solstice in December."