Spotify has teamed up with AccuWeather to build Climatune:
[W]e conducted a comprehensive study into the connection between music and weather. We partnered with AccuWeather, to gather data from hundreds of weather stations around the world. This included a year’s worth of data mapped to six different web toys: sun, cloud, rain, snow, wind, and clear night. We then correlated this with 85 billion anonymized, aggregated streams in over 900 cities, to uncover any patterns.