The characters are seen taking a Washington Flyer taxicab around D.C. This cab company exclusively serves Dulles International Airport.
The very first scene features a dog being hit by a car, at night, in Washington around the time of the Presidential Election. This occurs in November. The characters are outside, at night, only in shirts, and no "breath is visible". The trees are in full leaf. While Washington does get warms spells throughout the winter, the trees would not be in full leaf.
In addition, throughout the rest of the first year, people are in wool overcoats in Washington in May/June, which once again would be extremely unlikely at that time of year.