You ask most any old timer and they'll tell you that one needs to worry about frost on the first full moon during late September or October. The reason for this belief ranges from moon's gravity pulling humidity / clouds away allowing more rapid cooling or perhaps the moon helping to cool the atmosphere itself somehow, anyway. We just got past a full moon last weekend without a freeze, so perhaps we should worry when the next full moon comes around (more on this date later). The featured chart shows rather clearly that there isn't much of a relationship between the first fall sub 32 degree temperature for Ames and the number of days to the closest full moon date. What is interesting though is that the overall date average on this plot is around 9 October and you can likely guess when our next full moon is scheduled! Lock it in now? We certainly will have to wait at least a week or two more as temperatures look quite hot for the foreseeable future.

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Tags:   moon