What does the ios 15 weather forecast mean?

1. Left end point: the lowest temperature in the last ten days; 2. Right end point: the highest temperature in the last ten days; 3. The part with dots: the current temperature; 4. Total belt length: temperature difference. (long means that the temperature difference is large on this day, and short means that the temperature difference is small); Color part: The higher the temperature, the redder the color. On the contrary, the lower the temperature, the bluer the color, even purple.