Question-and-Answer Resource for the Building Energy Modeling Community
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This question has come up often in previous posts.
You can use the free program Elements to adjust weather files.
For your specific application, it seems like it would be easier to just set all of your exterior surfaces to "ground" adjacency, and then specify a ground temperature (changing one number in the .epw file).
If you want to specify the surface heat transfer properties in more detail, see the response to this question.
