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The striking thing to me is how big the year-over-year variation is and how extreme the outliers are. The average year is .8 stdev from the mean.

So calculating a 5-year moving average would seem a productive course ... over the 18-year period where we can calculate the moving average, rainfall appears to drop by .25"/year with an R^2 of .44. I would want more years to be sure that the beginning wasn't distorted, but if that remained a strong conclusion from the evidence, a moving-average line would be a nice addition to the chart.

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