Actually that's something you don't stick on a kneeboard, but have to learn to pass the exam. Essentially the greatest risk of carb ice is with high humidity (which typically coincides with low cloud and/or rain) and temperatures between 10 and 20 degrees. But it can occur under other circumstances as well. That's all you need to remember once you passed the exam.
The chart itself is a risk analysis chart, useful to understand the phenomenon. But it doesn't have a lot of practical use in the cockpit. If the RPM drops all by itself, I'm not going to consult such a chart to see if it might be carb ice or not. I'm going to apply carb heat.
If you are going to stick charts like this on your kneeboard, you might as well stick the whole PPL book series to your kneeboard.