[Clovis Fritzen] has given us an ingenious example, in the form of a PCB ruler with a built-in thermometer. This maybe doesn’t have the fancy seven segment or OLED display you were expecting tho ...

Walmart sells an 18-inch Bulova Weather Master wall clock with thermometer and hygrometer for over $200. If you've checked all the essential boxes, there's only one thing left to consider ...