Summer is one of the four seasons featured in The Legend of Zelda series. The Summer season is featured in two The Legend of Zelda titles and it usually characterized by its warmer weather.
Oracle of Seasons
In Oracle of Seasons, the four seasons have been thrown in chaos by General Onox and the Temple of Seasons has fallen into Subrosia. Several regions throughout the land of Holodrum will have Summer as its default season. During Summer, the warm weather will cause Vines to grow along walls, allowing Link to reach previously unreachable ledges.
Additionally, Summer is usually when the water of some lakes and rivers will recede. This often allows Link to reach the sea floor, accessing secret underwater caves and pathways. In order to change the season of a given region in the game Link must use the Rod of Seasons on top of a season changing stump to change it to the desired season.
The four seasons rotate every time Link visits Hena's Fishing Hole. The summer season is best for catching fish. The rarer types of fish become easier to catch during the summer, and it is the only season when Link can catch the Hylian Loach.