Specify tavefreq in runtime file "data" to be 30 days (in s). Dimitris Menemenlis 818-625-6498 On Apr 25, 2011, at 1:36 AM, "名 徐" <elisabei at yahoo.com.cn> wrote: > I want to make the 30 days average value of S,T,U,V,W as output when the time step is 1200s.How can I do?