Jay Leno's Tonight Show was back with new episodes last week (ending 9/3/10) but continued to trail Conan's Tonight Show adults 18-49 ratings on a calendar week basis (2010 vs. 2009). On a comparable calendar week basis, Leno's Tonight Show has never topped Conan's weekly ratings.
Leno's Tonight Show for the week of August 30 - September 3 averaged a 1.0 rating with adults 18-49 and Conan's Tonight Show ratings for the comparable calendar week last year averaged a 1.1 rating with adults 18-49.
Letterman's Late Show ratings fell below its ratings from the comparable year earlier week.
The chart shows the late night adults 18-49 weekly average ratings for 2009 and 2010.
Note: The week ending 7/2/2010, the Tonight Show was in repeats, and was delayed by Wimbledon coverage. The week of 7/9/2010 the Late Show was in repeats, and both shows Monday airings were excluded because of the holiday. For the weeks ending 7/16-8/6, Late Show was a repeat only on Friday. The week ending 8/13, Late Show was encores all week. Both Late Show and Tonight Show were repeats the week ending 8/20. For the week of 9/3/10, Late Show ratings were based on four days only.