Don't know and it does not matter. I had to take 4 levels of stat in college to get my degree. Loved it, frankly. One of the basic principles is the quality and relevance of the "sample". For example, if you wanted to know how the population of the world felt about green beans, you could not possibly ask everybody, so you would determine what a relevant sample would be and use it to predict the opinion of the total population. You would NOT ask 100 people.
They have been keeping records on weather for what, 100+ years? I don't think they have a big enough sample to adequately predict anything or make statements like they are. While I am sure that archeology to some extent can help them expand their sample, a lot of that is going to be guess work.
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Today's Featured Article - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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