“…Severe weathers are weather conditions that are hazardous to human life and property. There is great interest to evaluate changes in severe weathers due to their serious and adverse effects on natural ecosystems, social economy and human life (Easterling et al, 2000;Wang et al, 2012;Tang et al, 2013;Compeán, 2013;Saundersa et al, 2014). In recent years, the frequent appearance of severe weathers, such as high temperature and heat waves, rainstorm, snowfall and fog have been reported all over the world (Zhao et al, 2013;Chen et al, 2013;Zhang et al, 2015), and some of them have caused enormous damage to agricultural production and social infrastructure, brought about serious disruption to human activities, even personal injury and loss of life (Marengo et al, 2010;Barriopedro et al, 2011;Sun et al, 2014).…”