I need to get a 30yr average on Cooling Degree/Heating Degree days for a particular zipcode and Month/Year. Can one get this from the weather Underground API? If so, is there a code example somewhere or can someone show me how to achieve this?
Since each historical call can only provide data for one location on one day, you would need to create a script to increment the date over the 30 years. You would also need to parse the data for the CDD / HDD numbers, and average the return out. I can't really help you with that side of this, but I can help you with the API request itself.