ArcGIS model builder: How to reclassify 16,000+ rasters and do weighted sums on these

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I've been trying to build a model in model builder (ArcGIS 10.1) which can do the following task:

I have a folder full of ca. 16,000 raster files (.asc) representing mean temperatures for each day of 40+ years with names like 19800101, 19800102 (first two days of January 1980) etc. Now I want:

1. import each .asc to raster
2. reclassify each raster (e.g. temperature x = 0, temperature y = 1)
3. do a weighted sum of all rasters of one year (to get the number of all days with temperature y)
4. write resulting yearly rasters to a different folder

I tried different things but nothing worked for the whole process. I can get 1) and 2) working in a model but fail to do 3) and 4) along with it automated and had to do it by hand which is very time consuming. I suppose it comes down to using different iterators, but I just can't find a way to get it working for days now. I'm a little desperate by now

Does anyone of you can point me in the right direction for doing this task automated and efficient in model builder? Help would be very much appreciated. Thank you.

Happy holidays!



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