There is an enormous amount of latent weather data to be extracted from existing sources and they, I think, are doing a great job finding and using them.

I am also working on similar efforts, focused on using labelled photos of the sky with ML to extract weather data from outdoor photos, and using barometers in phones: https://play.google.com/store/apps/details?id=com.allclearwe...

I'm shocked there aren't more efforts in this space. I know IBM is using barometers in phones now, and I suppose Apple may try that post-Dark Sky acquisition, but I'm still surprised there aren't more!