The feature temperature on the icon badge was removed from the app because Apple company required it. 
You can read below the email from Apple AppStore review team. We can't don't follow the Apple rules, because they will remove the app from AppStore.

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Hello,

We are writing to let you know about new information regarding your app, WEATHER NOW X, version 1.1.1, currently live on the App Store.
Upon re-evaluation, we found that your app is not in compliance with the App Store Review Guidelines. Specifically, we found:
Design - 4.0 We noticed several issues in your app that contribute to a lower quality user experience than Apple users expect, such as: -Your app uses badge notifications for unintended purposes. Badge notifications should only show the number of unread notifications an app has.
To ensure there is no interruption of the availability of your app on the App Store, please submit an update within 1 week of the date of this message. If we do not receive an update within 1 week, your app will be removed from sale.
If you have any questions about this information, please reply to this message to let us know.
Best regards,
App Store Review 

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Yes, we know that the feature was very important in our app and many customers who paid for the app, want to use that. But Apple doesn't want to see that in AppStore. 
We think about a solution. 
Thank you for understanding.