What is it?
The Rare-o-Meter is a daily indicator as to whether the bushes will be dripping with rares. It's presented in an ascending scale from Shit to Monster. If it's Shit you might as well stay in bed but if it's Monster then cancel all appointments, phone in sick and get out birding!
How does it work?
Data from a wide variety of sources is fed into a top secret algorithm to calculate the prediction.
Isn't this a rip-off from somewhere else?
The idea is (heavily) based on the Punkbirder rare-ometer which they "can't be arsed to update any more".