average wind field

 
I want to caculate the average wind field in April 2011
the script I have download can only caculate one day average wind field.
when I modify the script such as below:

from :

a = addfile("/storage/sdc1/nlcheng/nudge/box/box/wrfout_d01_2011-03-26_18:00:00.nc-box.nc","r")

to:

files = systemfunc("ls -1 /storage/sdc1/nlcheng/nudge/box/box/*00:00.nc-box.nc")
a = addfiles(files,"r")

it turns out errors. I want to caculate the average month wind field.how can i do ?

need your help

thank you !

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