Entirely subjective, but I often think of certain games as “summer games” because I played them in the summer as a kid. Tony Hawk games are absolutely on that list, as are Dave Mirra’s BMX, Tomba! 2, Crash Bandicoot, the Sonic games, Vectorman, Mortal Kombat, Pokémon Stadium, Bomberman, etc.

Some games that actually have a summery vibe would be Cool Spot, Donkey Kong Country (1 and 2 mostly, and parts of 3), Zombies Ate My Neighbors, Aladdin, The Lion King, Pitfall, Shantae, Banjo-Kazooie has some summery areas, maybe Yoshi’s Story?