Definition of summer:
(n) :
one of four
seasons, traditionally the second, marked by the longest and typically hottest days of the year due to the inclination of the Earth. Typically regarded as being from June 21 to September 20 in the
Northern Hemisphere and from December 21 to March 20 in the
Southern Hemisphere; a
horizontal beam supporting a building
"the heat of summer"
(v) :
to spend the summer, as in a particular place on holiday
"we like to summer in the Mediterranean."