This comment is so HN. If you were expecting me to publish a full report with links to MLS data, you'll be sorely disappointed. It's just one dude running around the neighborhoods in his fancy underwear, making a mental note of the short little "home for sale->this way" signs at the corners over the course of a year. All I can tell you is, a year ago those signs disappeared in a few weeks. Now they take over a month or more to disappear. Full analysis will not be forthcoming.
Make of it what you will, or make nothing of it at all and enjoy the rest of your day.