It used to be that sites like https://www.wunderground.com/history/airport/KOAK/2016/10/10/DailyHistory.html?format=1
would return a simple text file showing the historical data for that day at that weather station. We could scrape the hisotrical weather data from that without needing an API key for weatherunderground (which would be a hassle for most users) However, those type of links no longer work, instead this was the only option I could find:
https://www.wunderground.com/history/airport/KOAK/2016/10/10/DailyHistory.html

We need to find another way to access/interpret this data...