Seven weeks back and seven Leno Tonight Show ratings wins over Letterman’s Late Show. However, for the latest week ending April 16, Letterman was in repeats.

For historical reference, here are last season’s season-to-date averages through April 17, 2009:

ADULTS 18-49
11:35 p.m. ET
NBC “Tonight,” 1.4/6
CBS “Late Show,” 1.1/4
ABC “Nightline,” 1.1/4

11:35 p.m. ET
NBC “Tonight,” 5.2 million viewers
CBS “Late Show,” 3.9 million viewers
ABC “Nightline,” 3.9 million viewers

For additional historical reference, here is the chart of the adults 18-49 ratings for the entire run of Conan O’Brien’s Tonight Show, minus the final week of repeats prior to the Winter Olympics.

Note that earlier versions of the Conan/Letterman chart had a rolling 4 week average line. It has been removed in favor of a “connect the dots” line.

Posted by:TV By The Numbers

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