The astronomical summer as mandated by the International Astronomical Union begins June 21 in the Northern Hemisphere and December 22 in the Southern Hemisphere. These dates are only "official" for the IAU.
The climatological summer as mandated by the World Meteorological Organization begins June 1 in the Northern Hemisphere and December 1 in the Southern Hemisphere. These dates are only "official" for the WMO.
Canada and the USA customarily observe the astronomical summer while Australia and New Zealand follow its climatological counterpart. Preference for the two methods of reckoning vary among other western countries. Many Asian countries use lunar dates to reckon the first day of summer.
June 21st, 2011... first day of summer. June 20th, 2012... first day of summer. June 21st, 2013... first day of summer. June 20th, 2014... first day of summer. June 21st, 2015... first day of summer.
The summer solstice in 2011 will occur on June 21, 2011.
The first day of summer is June 21st
Tuesday, June 21, 2011.
1st June
Tuesday, June 21, 2011
There are exactly 19 more days
The summer solstice happens. The summer solstice is also the winter solstice in the opposite hemisphere. On the summer solstice (on the northern hemisphere), the northern hemisphere is tilted most to the sun, giving 24 hours of light to the Arctic Circle and 24 hours of darkness to Antarctica on the day of it.
September 22
Tuesday 21st June 2011
the first day of summer is on the 1st of June 2010
Summer. The first day of summer is the longest day of the year. The first day of winter is the shortest day of the year.