How does Apple 6plus add weather forecast to the notification bar?

Apple 6s plus adds the weather to the notification bar, as shown below:

Step 1: First find the "Settings" option of Apple 6s plus.

Select the privacy menu.

Step 2: Select the "Location Service" option after entering.

Locate the Weather option and open it.

Step 3: Next, go back to the "Settings" option page and click "Notification Center".

Open the Today Summary option.

Step 4: Finally, you can see the weather in the current city in the "Today" option of the "Notice Bar".