Just found this app this morning, a nice version of Seasonality for your Mac. I have a lot of the same complaints and accolades for it as I do the iPad version. I do like the control you have over the graph data. Seasonality’s graphs did take me a minute to figure out what they are for, so don’t feel like you are the only one if you get confused at first.

(Also there is Wx that offers a far more, umm shall we say, nerdy view of weather data.)