You appear to be trying to use two display libraries at once, and expecting text outcome with graphic library commands. I think Tolpuddle's comment was legitimate, that command should be redundant.
You might try deleteing all reference to the GFX, and using the lcd.print commands as shown in the HelloWorld example with the PDC8544 library.
I think there is a swag of redundant junk in your temperature code too, but you might sort out the LCD first.
If you are actually trying to mix text and graphics, I think you are still on the wrong tram. There are better displays than the 5110 for that, but I think you might get a result which may be worth the intellectual exercise by ditching both libraries, and using the RinkyDink/Henning Karlsen 5110 library.