Perfect summer reading. But, why is everyone always talking about summer reading? Winter is the time for reading, when you can't go outside.
That's why they distinguish summer reading. In summer, you want to read something you can absorb while lying on the beach or in a hammock, something you would take on vacation to fill the time between sightseeing. Summer books are light in mood, not too intense or deep or difficult. More effortlessly entertaining. So for me that would be, like, a Tom Perrotta novel or 
Gone Girl or Raymond Chandler or maybe something like 
The Great Gatsby.
Winter is when people tackle books that require more time and attention: 
War and Peace or 
Ulysses or 
Moby-Dick or maybe, if something relatively light is needed, 
Middlemarch