[RegCNET] How to calculate monthly precipitation?

[suxingtao at sina.com]

 Hi everyone,
I want to calculate monthly precipitation with ATM output variable 'tpr'. For example, to calculate precipitation of July, is it correct to calculate with 'ave(tpr,t=1,t=124)*31'? If not ,how to calculate it?
Thanks for your help.
Regards,
Su
 

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