Most bikable cities

Atlantic Cities has some analysis by Richard Florida identifying the best biking cities and neighborhoods for commuting.

While it is understandable that they emphasize the physical design and infrastructure (that is the point of the article), I would like to see them incorporate climate into the overall scoring. How many days a year is Tuscon's heat dangerous to cycling? How many days each year are rain and snow significant barriers in places like Minneapolis?  (And, yes, I know that there are still some bicycle commuters on 15 degree days in Madison and Minneapolis, but far fewer than on 50 degree days)