This doesn't surprise me at all. (Note: Haneda is in Tokyo)
What's worse is Tokyo (and much of Japan) gets a lot of bad weather from typhoons during the summer. But the weather doesn't disrupt things very much. Most of these other places (like London, Frankfurt, Vancouver, etc.) don't have this problem, or other problems with natural disasters (Japan gets earthquakes all the time), but they still can't keep things working smoothly for some reason.
I wonder if it's the same as with the Shinkansen: they are not running when there is a typhoon, and stop when there is an earthquake, but typhoon/earthquake induced delays/cancellations are usually not included in statistics (at least the ones you generally read in the press). So it's possible that due to typhoons more than 13.6% of flights are late in Haneda, but they are simply not included here.
This doesn't surprise me at all. (Note: Haneda is in Tokyo)
What's worse is Tokyo (and much of Japan) gets a lot of bad weather from typhoons during the summer. But the weather doesn't disrupt things very much. Most of these other places (like London, Frankfurt, Vancouver, etc.) don't have this problem, or other problems with natural disasters (Japan gets earthquakes all the time), but they still can't keep things working smoothly for some reason.