Average Viewership Per Episode:

US Viewers (in millions):
Season 1: 9.16
Season 2: 11.64*
Season 3: 7.69
Average Comparisons:
Season 1 v. Season 3: +1.47
Season 2 v Season 3: +3.95
It’s quite worrying when a new season isn’t rating as high as the first season, even though it’s already been renewed for a 4th. And keep in mind, these are averages so it doesn’t matter so much that the season isn’t over unless the last few episodes pull in millions more views than usual. With graduation that might be possible. I think merchandising and music sales are important to Glee’s existence. But as it is Glee was number two in its time slot last week.

Here we can see here Glee’s ratings are hitting lows it hasn’t been at since it first started. Season 3’s Mash-Off, Hold On To Sixteen, and Extraordinary Merry Christmas follow as the next three least viewed episodes.
- Season 2 had the highest rating episode ever, *The Sue Sylvester Bowl Shuffle, at 26.80 million viewers - almost double that of the next highest rating episode of that season (Britney/Brittany) at 13.51 (third highest overall) or the second highest rating episode ever (Hell-O) at 13.66.
- Pilot received an audience of 9.62 million in its first airing.
- Hairography was the least watched episode ever at 6.17 million while the recent Big Brother episode was the 4th least watched episode ever.
(Source: Wikipedia)