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Even a groundhog’s shadow wouldn’t hide early signs of spring in much of U.S.  科技资讯

时间：2023-02-02   来源：[美国] Daily Climate

Heat accumulation (accumulated growing degree days) across the U.S. since January 1, compared to the 30-year average (1991-2020).      原文来源：https://www.washingtonpost.com/weather/2023/02/01/groundhog-day-spring-winter-2023/

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