When is the coldest year in Xi'an?

——On November 7, 2009, heavy snow fell in Xi’an, which was incredibly early;

——On New Year’s Day in 2010, the highest temperature in Xi’an was as high as 13 degrees;

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——On April 13, 2010, there was snow in Xi’an, and the lowest temperature was 0 degrees;

——On a day in mid-August 2010, the lowest temperature was only 19 degrees.