What's the temperature Mr Cricket...?

I was listening to the latest George Lamb podcast while I was running earlier and heard something that really needed an independent web-search to validate what I'd heard, namely that by counting the number of times a cricket chirps in 14 seconds and then adding 40 you'll know the current temperature in Fahrenheit. Sounded a bit dubious, but I subsequently found this on the Library of Congress website. The article actually says it's 15 seconds then add 37, but given that it's a pretty cool fact I'm not going to argue. There's some other interesting stuff to be found there, and I now know that I won't be able to have a zebra for a pet as they can't be domesticated. Oh well, back to the original plan of getting a monkey butler....