Since one year ago, Cortana has been displaying weather information on the Live Tile, including current conditions in number form and weather animations. However, back then Cortana would mostly run this feature only in the early morning, as noted in our forums in 2014.
Nevertheless, starting over the weekend, Microsoft evidently has increased the frequency of this feature past the early morning. In fact, it now appears to be the default status tile for Cortana if you have the weather interest enabled.
Full story from the WindowsCentral blog...