Here are the top 25 grossing summer films of all-time according to Filmsite.org. All numbers are based on domestic gross revenues as of August 2014. These have not been adjusted for inflation.
25. The Lion King $312.9 million(1994)
1994
24. Indiana Jones and the Kingdom of the Crystal Skull $317.1 million(2008)
2008
23. Iron Man $318.4 million(2008)
2008
22. Transformers $319.2 million(2007)
2007
21. Shrek the Third $322.7 million(2007)
2007
20. Forrest Gump $329.7(1994)
1994
19. Spider-Man 3 $336.5 million(2007)
2007
18. Finding Nemo $339.7 million(2003)
2003
17. Transformers: Dark of the Moon $352.4 million(2011)
2011
16. Jurassic Park $357.1 million(1993)
1993
15. E.T. The Extra-Terrestrial $359.2 million(1982)
1982
14. Despicable Me 2 $368 million(2013)
2013
13. Spider-Man 2 $373.6(2004)
2004
12. Star Wars: Episode III - Revenge of the Sith $380.3 million(2005)
2005
11. Harry Potter and the Deathly Hallows, Part 2 $381 million(2011)
2011
10. Transformers: Revenge of the Fallen $402.1 million(2009)
2009
9. Spider Man $403.7(2002)
2002
8. Iron Man 3 $409 million
7. Toy Story 3 $415 million(2010)
2010
6. Pirates of the Caribbean: Dead Man's Chest $423.3 million(2006)
2006
5. Star Wars: Episode I - The Phantom Menace $431.1 million(1999)
1999
4. Shrek 2 $441.2 million(2004)
2004
3. The Dark Knight Rises $448.1 million(2012)
2012
2. The Dark Knight $534.9 million(2008)
2008
1. Marvel's The Avengers $623.4 Million(2012)
2012