I remember seeing a “long-term rain forecast” scam several years ago based on that principle. They claimed to be able to tell you which days would be clear in the next 50 years with 90% accuracy, but carefully worded their pitch to not imply any accuracy for claiming what days it would rain. Because it rains about 10% of days on average, this claim is technically true regardless of the contents of the forecast.
I remember seeing a “long-term rain forecast” scam several years ago based on that principle. They claimed to be able to tell you which days would be clear in the next 50 years with 90% accuracy, but carefully worded their pitch to not imply any accuracy for claiming what days it would rain. Because it rains about 10% of days on average, this claim is technically true regardless of the contents of the forecast.