What is the coldest year in Xi 'an?

—— On June 7th, 2009, Xi 'an had 165438+ heavy snow, which was unusually early;

—— On New Year's Day of 2065438+00, the highest temperature in Xi 'an was as high as 13 degrees;

—— It snows in Xi 'an in April 13, 20 10, and the lowest temperature is 0 degrees;

-20 10 On a certain day in the middle of August, the lowest temperature was only 19 degrees.