How does Apple 6s 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, and then select the "Privacy" menu.

Step 2: Select the "Location Service" option after entering, and then slide down the menu to find the "Weather" option to turn on the function.

Step 3: Next, return to the "Settings" option page and click "Notification Center" to open the "Today's Summary" option.

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