The actor claimed that he and his girlfriend felt blue while shooting the movie because of the weather.
"Kurbaan was hard work. Period. In fact, the Philadelphia schedule was plain hell. It wasn't anything like a picnic shooting for the film," Khan told India E News.
"It gets dark there at 4pm itself. Moreover, it's so cold and at minus 10 degrees it can actually get really depressing. Since we were shooting in sync sound, it was extremely difficult to get the pitch and tone right while delivering our dialogues."
The film, directed by Rensil D'Souza, also stars Vivek Oberoi, Dia Mirza, Om Puri and Kirron Kher. It is released on November 20.