Painted in 1917, it depicts a flag-bedecked 5th Ave on a rainy winter day. Hassam was a fervent supporter of US involvement in World War I and did a series of patriotic flag paintings during the war, of which this is the most famous. It has long been a presidential favorite and is so closely associated with the Oval Office that had it has adorned the walls of many a fictional White House.

http://www.frederickhassam.org/The-Avenue-in-the-Rain-large.html