Hi there,
So looking at this from my house , LOL it’s easy to be a critic, but hear me out.
This is great for what you have, But for LOCAL op not so much either.
It’s a perfect app for the E-ink display. The last temp will always be displayed even when it’s a sleep . No power penalty and you get a local display that is accurate and a backup if the network goes down. (someone can always look at it).Do you place the whole unit inside, what about temperature for battery? lipo’s don’t like the cold.
Check out this makersmart board this guy did. same kinda setup 2 or 3 temp sensors and an IMU , ESP32 his DS18B20’s have the connector one the end too. Food for thought. Here are some pics of a set I helped with a similar project his sends data to a online web page you can view.
His schematic is open source,
I like this…LOL
GL 
PJ 