Weather does not change very quickly, so it is one of the things that can be displayed on a e-paper display which cannot be updated on the fly, but only as the whole screen at a time.
There is a product called DHT11 on the market which measures temperature and humidity, from which you can calculate the dew point.
These are easily used in an Arduino sketch with a library called dht11.h (download here). This is the project
Sketch EPD_TEMP is here. You also need the updated epda.h header here, put it in your libraries folder.
Good for SOTA activations and field days!
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