Very interesting, I had a look at your link. I must admit that I'm a bit confused, as none of the graphs at the top of the page mentioned temperature.

Instead they measured 'Frequency (Hz)' on a scale from 0 to 0.5. As you will be aware, 0.5 Hz would be one 'something' every half a second. I tried looking at the rest of the page but that didn't provide me with any more understanding.

I would be grateful if you could post some additional explanation.