The Teessiders were riding high in the Championship table at the turn of the year, but have slipped out of contention since with just three victories in 19 games.
While their home record is their best in 15 years - they have collected 41 points from their 22 fixtures at the Riverside Stadium to date - they have managed only five wins and 17 points on the road.
Mowbray told the club's official website: "Some of the performances have more than warranted it, and yet we can't hide from the statistics.
"Our home record is as good as we have had for a number of years and if we had a half-decent away record, we would be in the play-offs.
"We have found it difficult and everyone will have their own opinions on why. It's too late now, the season has two games to go and we have got to try to get the six points."