What does this icon mean in ink weather?

It's sunrise time. I have used almost all the weather software on the market. In fact, all the data are from the National Weather Service, and the icons are made according to the standards. Comparatively speaking, it depends on whose information is more comprehensive and updated more timely. Now I use the App Store to directly search for "weather forecast", and one of the top five is Minesage. Advertising is less than ink. If a city is set, it will be updated on time every day. If the city has an early warning or the weather changes suddenly, it will be notified as soon as possible.

And the interface is simple and leisurely, which looks more comfortable.

I hope to adopt it. I did it myself. It's not easy to get back to work.