For the Northern Hemisphere that would be on or about December 21st
20th June is the shortest day and longest night and it falls on a Sunday, so have a sleep in!
The winter solstice.
melbourne
The longest day in any year is the summer solstice. In 2011, this will occur on June 21 in the Northern hemisphere and December 22 in the Southern hemisphere.
For the Northern Hemisphere that would be on or about December 21st
The first day of summer - on/about June 21 is the longest day and shortest night.
seasons
20th June is the shortest day and longest night and it falls on a Sunday, so have a sleep in!
If you mean the longest: When you have the longest day, you'll also have the shortest night, and vice versa. In the northern hemisphere, the longest day is around June 21, and the shortest day is around December 21. In the southern hemisphere, it is the other way round.
The winter solstice.
Winter solstice is the longest night, summer solstice is the longest day. Opposite is equinox when night and day are exactly the same length.
The summer solstice has the longest day and the shortest night of the year. The winter solstice has the shortest day and the longest night of the year.
Tornadoes are more common during the day, but they happen at night fairly often as well. About 58% of tornadoes occur during the day.
Chennai
melbourne
December 21-22 and the longest is June 21-22