Almanacs and weather predictions

Today we were reading about Benjamin Franklin and how he became quite wealthy selling his famous "Poor Richard's Almanac" which Mr. 9 had recently read. Mr. 7 asked what an almanac is and we spent some time discussing things you would find in an almanac - a calendar, the tides and phases of the moon, interesting facts, and weather predictions. Mr. 7 suddenly remembered reading about how people would predict the weather based on the moon.
"I think there are typically storms 2 days after the full moon," he reported.
During quiet time he found the book he had read this in and had remembered it exactly right. So now we're going to chart the weather and phases of the moon. We'll see how accurate we can predict the weather.