I'll admit, I was skeptical at first. I mean really, this thing just sounds like some unknown magic lol
You can't just expect it to work the first day you get it. Due to shipping, it will have been jostled a lot and will need to settle before it can work it's strange magic. Mine took about 2 weeks to really kick in its mojo.
Now understand, this thing won't tell you whether it'll be hot or cold outside. It WILL tell you if there will clear, cloudy, rainy, snowy, foggy skies though. It also will not give you the forecast for the day you look at it. The forecast it gives is for the day after. It's kind of like the things mariners use to tell how the weather will be when they're out at sea.
I think this thing is pretty nifty really. It hasn't been wrong yet since it settled.