Translation:

" If the stone is:

-Wet = it is rain -Dry = it is not not rain -Makes shadow = Sunny -White the top =Snow -Does not appear to = It is foggy -Jiggle = It is Windy -Jumps up-down = Earthquake -Missing = Tornado "

It is so easy, it doesn't need expensive instruments... OK, no tempenature measuring..... Invented in a small villge in Hungary :-P