Vancouver is really very beautiful, and pretty nice to live in too since the crime rate is decent, there's stuff to do etc. I'm shocked that Victoria didn't beat it though.
Tokyo I imagine got so low because of the population, because I can't think of any other reason - that city is wonderful in all other respects.
This can't be accurate though, it depends on what you hope for when you move somewhere. It has to be looking at what someone trying to raise a family would want, and few other aspects.
For clarification, these statistics answer this question: "What is the city where the least people are being poor, being murdered, dying early because of a cough, being taxed excessively, getting road rage, or getting no schooling?"
And as a basis for this they use statistics. (Remember the great truth: "There are three kinds of lies: lies, damned lies, and statistics.")
I don't see how Honolulu and San Fran are the best cities to live in in the United States. And as far as the weather goes, San Diego has the best weather of any place I've been in my life.