Based on reported ticks. Unfortunately, people like me mess this up because I climb all the time, but rarely record ticks unless I comment on something. So at best it's loosely accurate.
I ventured a guess that it was also based on temperature of an area: more crowded when it's 60-80 degrees F, less crowded on either side of that. Probably a good heuristic, in general. (except for ice climbs and alpine routes..)
I agree Dan(s), I live by the popular Rotary Park, and I know many people choose to boulder higher up where it is cooler in the summer months. However, it now also costs to park, and I am sure that is bringing the numbers down to some extent.This could be an interesting analysis to watch over time (from year to year). I guess reporting just ticks over times visiting an overall area just does not fully cut it...
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