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I've been running WeatherCat and WeatherSnoop as part of the test environment for the template sets. Of the two,
WeatherCat provides much more in weather variables available to the website, and graphs. I run Weather-Display (PC/Win) for my main site (and have for years), but I have no experience with it on the Mac -- it does provide the most weather variables and statistics of the three.
Hope this helps...
Best regards,
Ken