Ok, so after being stuck for 4 days on the weather app challenge I have finally found the solution:
Basically, the two weather services they recommend have since then been blocking Code Pen (hackers or pranksters probably, idk why).
Open Weather Map, and Dark Sky .net incase you wondered.
Anyways so I did a lot of reading and searching google trying to find a way around it, and the simple answer there isn’t one. At least not one that is easy (I even tried routing it through my own live website… which turned out to be brain damage waiting to happen). So to save you from the frustration that I just went through; there is another free open web app: https://apixu.com
Hope this helps anyone else who found themselves getting frustrated on this challenge, and happy coding