At first , analysis of extreme temperature ' s spatial distribution of variety trend shows that the minimum temperature in the north are going up while the maximal temperature in east china declining widely , which is a numerical characteristics of prevailing warmer - winter in recent years . so the change of minimum and maximal temperature are dissymmetrical 首先從總體上,分析極端最高和極端最低溫度變化趨勢的空間分布:北方地區(qū)極端最低溫度普遍上升,且幅度較大,是近年來暖冬盛行的一個數(shù)值化特征;極端最高溫度在東部普遍下降,最低最高溫度變化具有不對稱性。