@Pat I am looking into DarkSky now and the API seems very easy to use and the data seems very rich. The perfect alternative it looks like as OpenWeatherMaps is missing historical data in the normal API and requires seperate billing and API call for historical data. There website clearly says do not direct customers to generate their own keys, each company should use one key.
Their pricing seems very reasonable so I think I will discuss this with Ray and hopefully get this solution setup. This will stabilize the scale values currently being seen with OpenWeatherMaps as the source.