I downloaded an edmo dataset of the cera-20c model of 1 model ensemble. I want to convert these data, which are in [m] to mm/month. Further specifications: 0.125/0.125 grid, -29/30/-30/31 area. Example of the data (see Attachment) of total precipitation January 1980:

0.00972608 0.00957544 0.00941561 0.00924491 0.00906292 0.00886799 0.00865884 0.00843403 0.00819166 0.01005578 0.00989428 0.00971898 0.00952822 0.0093197 0.00909092 0.00883853 0.00855918 0.00824787 0.01038548 0.01021917 0.01003489 0.00982972 0.0096001 0.00934102 0.00904642 0.00870878 0.00831765 0.01071518 0.01055033 0.01036417 0.01015189 0.00990765 0.00962391 0.00928983 0.00889097 0.00840687 0.01104488 0.01088818 0.01070745 0.01049622 0.01024633 0.00994609 0.00957837 0.00911808 0.0085245 0.01137458 0.01123292 0.01106578 0.01086541 0.01062116 0.01031674 0.00992645 0.00940829 0.00868705 0.01147842 0.01135348 0.01120367 0.01102044 0.01079165 0.01049747 0.01010488 0.00955559 0.00619612 0.01088233 0.01076115 0.01061573 0.01043772 0.01021541 0.00992938 0.00954828 0.00901466 0.00575109 0.01028645 0.01016882 0.01002758 0.00985479 0.00963917 0.00936149 0.00899168 0.00546506 0.00530627

My method: Taking the average of these numbers multiplying by 31(days) and 1000 (to mm ) gives me 289 mm for January. But this does not seem right. I hope you can provide me with the right answer.

Thanking you in advance.

Louwrens Timmer