Weather Runs Hot and Cold, So Scientists Look to the Ice

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Daffodils bloomed in St James’s Park in London on March 1.

Some people call what has been happening the last few years “weather weirding,” and March is turning out to be a fine example.

As a surreal heat wave was peaking across much of the nation last week, pools and beaches drew crowds, some farmers planted their crops six weeks early, and trees burst into bloom. “The trees said: ‘Aha! Let’s get going!’ ” said Peter Purinton, a maple syrup producer in Vermont. “ ‘Spring is here!’ ”

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