Feature to raster, loop for model builder

Hello,

I'm trying to make a model for feature to raster.

The feature has 12 columns named for each month of the year. The values ​​for each month are precipitation amount.

I want to convert the features to raster using a model but can not find the way to make it automatic. The result would be 12 rasters representing precipitation for the month selected.

My problem its: the "field" parameter in the feature to raster tool, how can i use iterator for columun or theres another way?

Thanks for the help.


Marcelo Oyuela