Definition and simple explanation:

Of the summer is the season between spring and autumn. In the northern hemisphere, the meteorological summer begins on June 1 and ends on August 31. At this time, winter is prevalent in the southern hemisphere.
In contrast, the astronomical summer begins mostly on June 21, the longest day of the year (see also summer solstice).
In the summer months, the temperature occasionally climbs to over 30 ° C. This makes summer the season with the highest temperatures. The sun shines intensely, as the angle of incidence of the sun's rays is steepest in summer. This benefits trees, plants and flowers. The metabolism of plants (photosynthesis) reaches its peak.
Warm temperatures also liven up the wildlife. Insects are now particularly active: bees collect nectar, ants scour the area for food, ticks search for landlords and butterfly caterpillars feed on the undergrowth. The chicks of many species of birds still hatch during the summer, because now the most abundant food supply exists. Warm-blooded animals, including amphibians and reptiles, are even dependent on the warmth of the sun. During the summer months, they are actively looking for food and a breeding partner.
In principle, summer can be subdivided into early summer (June), midsummer (July) and late summer (August). In early summer most of the grasses are blooming, in the middle of summer the grain harvest and berry fruits are matured. Only in late summer can then be picked apple, plum or pear. Mostly they are left hanging on the trees until autumn.