A couple of weeks ago, I heard my buddy and co-worker Sigmund Bloom say on the Footballguys Podcast that Jamaal Charles was having one of the craziest seasons ever. As Sigmund noted, Charles has been an incredibly frustrating fantasy player. This year, he had three games with 10 or fewer rushing yards… and he also became the first player in NFL history with two games with over 225 rushing yards in the same season.

Did you know that Kansas City finished 2012 fifth in carries? Under Todd Haley, Chiefs fans and fantasy football players were constantly frustrated by Thomas Jones, who Haley seemed to always find a way to give an extra ten carries to. This year, under Romeo Crennel, Peyton Hillis was the complementary back, but he was not nearly as predatory. Still, while Charles finally received the lion’s share of the carries, he was once again an inconsistent fantasy player.

Take a look at Charles’ weekly game logs:

That’s a pretty incredible distribution, but how crazy is it?

I looked at the standard deviation of every game by every player in a season with at least 1,000 rushing yards from 1960 to 2011. As it turns out, Charles has had one of the most inconsistent seasons ever. While he gained 1,509 rushing yards, he had a standard deviation of 71.4 yards. That may not mean anything to you in the abstract, but it would place him as the 4th most inconsistent back since 1960.

The top spot is reserved for the rookie version of Adrian Peterson. In 2007, he was still splitting carries, and while Peterson had 225 yards against the Bears and broke the single-game record with 296 yards against the Chargers, he also had 3 yards against the 49ers and three other uneventful games.

What about the most consistent? That honor is reserved for John Riggins in 1983.