Harrington threw for 79 touchdowns while giving up 85 picks. His TD rate when attempting a pass was 3.1% and his interception percentage was 3.3%. He lost 744 yards while being the victim of a quarterback sack 124 different times. He averaged 181.4 yds per game through the air. In 81 games in his career, Harrington was successful on 1,424 of 2,538 tries for 14,693 yards.
In his last year, Harrington threw for a total of 0 yds with 0 touchdowns and 0 interceptions. He was sacked 0 times for a total of 0 yards lost. He had a quarterback rating of 0.0 with a TD rate of 0.0% and an interception rate of 0.0%. His longest pass completion went for 0 yards and he passed for 0.0 yds per contest. Harrington connected on 0 of his attempted 0 throws in his last season for a completion percentage of 0.0%.