I was only aware of environment-induced measurement errors (the air temperature) and didn't want to use a dual system since it would complicate things a bit.
But the time delays didn't make any sense to me, that's why I posted here, to find out if it was the normal behavior of the sensor or I was doing something wrong... Also the project isn't fully functional, I've only described what it will become
Slightly off-topic: What are 'NL' resistors on a schematic? I'm trying to read the microcontroller dev board schematic and they're pretty common, didn't find anything on Google...