Help with Weather API for project (underground weather API)

Help with Weather API for project (underground weather API)
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#1

So the problem Im having is that no matter what variable i try to access with my success function it always returns undefined. I had to run the url through cross origin work around because there were problems with security when I tried to access without cross origin. Here is my API info https://www.wunderground.com/weather/api/d/docs?d=data/index
Any help with this would be awesome, on a side note try not to run this too many times since the queries are limited to 10 a minute I believe.