The hottest day in this year

Today I got a train , Keihin-Tohoku line , for the first time since we moved to new house.
I used to hear that trains on this line were very crowd at rush , but it turned to be not so that in reality.
I think I'll be able to endure going to and from the office by train.
By the way , it was a very hot day today! , but our new room has good ventilation since it is located on a corner of condo and has many windows.