Groundhog Day

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Digging Deep Into The History of Groundhog Day

Groundhog Day derives from Candlemas, a festival that has been celebrated since the fourth century. Traditionally, observers would light candles on an early February day to brighten things up, and monitor the weather to see if spring was approaching. Many poems have been written to celebrate Candlemas, such as this Scottish couplet: "If Candlemas Day is bright and clear, there'll be two winters in the year."
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The Statistics Prove It: We've Got The Groundhog Day Rule Backwards

Every now and then, some statistical research comes along that shifts paradigms, rewrites perceptions and sets the stage for a new era in human thought. This is not one of those times. No, this is about apparently long-ignored research on the value of a rodent in determining medium-term weather forecasts. Groundhogs would be much better weather predictors if we just reversed the Groundhog Day rule.