Questioning data coming through Third Reality Temp/Humidity Sensors

[stone island]

I recently picked up a pack of three Third Reality temperature + humidity sensors. Neat little things, but after setting them up and monitoring them I'm finding some odd behavior in the data that may very well be real but to me feels like there is a gremlin hiding within. Looking for any kind of guidance to whether these things are acting up, or if I just need to temper my expectations for how a temperature sensor is.

The behavior in question is constant swinging of the temperature readout. It seems to jump an entire degree in either direction; while it at least stays more or less around what I expect the temperature to be based on my old thermostat which isn't incorporated to HA, it is still flopping around and making it hard to actually know what the temperature really is. The product listing gives a margin of error of 0.3 C, which comes out to about 0.54 F. But I am seeing swings of about a whole degree F.

For what it is worth, the humidity readouts do appear to be working much more reliably. Screenshot attached if it gives any clues (ignore the timescale, that's Librewolf replacing my timezone with GMT). Also enabled LQI and RSSI to see if maybe connectivity was dropping, the one seems a bit weak but still okay enough to function...

[visual path]

Is it a rounding error. You can set the precision by clicking the entity and then the gear.

[stone island]

Would not have thought of that, currently it's set to one decimal point of precision. Guess lets find out what happens with two.

[stone island]

Still doing it, seems like. I'm beginning to question if this is just expected? Like if temperature sensors in general are going to hit pockets of air where it is suddenly just warmer or colder, and then some time later go back to normal?

I would expect it to be a bit less uniform if that were the case though, the consistency of it always going up or down a complete degree is curious to me, and the readout in HA seems to always be fine, it makes me wonder if the sensor itself is just not the most reliable and I should look elsewhere.

[pastel pebble]

the third reality temperature/humidity sensors that I have as a battery optimization will only report a temperature change if it exceeds some fairly large threshold, resulting in the graph having fairly large jumps rather than smoothly tracking. but the data you have looks really weird with all the little wiggles combined with big jumps...

are you doing any additional smoothing to the data in home assistant, or are these the raw values reported by the seonsor?

here's what 24h of data from my third reality 3RTHS24BZ sensors looks like, for reference.

annoyingly, the behaviour of the sensors i have changed after a firmware update, they used to report much smaller changes much more frequently :(

[stone island]

These are all raws, unfortunately. I thought about doing some kind of statistical averaging to try and level it out a bit but of course then I'd be getting inaccurate data since it'd be the average or some other statistic derived from the already jumpy raws.

At least glad to hear that I'm not losing my mind. Part of it is no doubt the thermal stability of my place is just garbage tier, part of why I got these was to evaluate just how bad it was (you can noticeably feel the temperature and humidity both change on your face as you walk up my stairs)

But I wouldn't have expected these kinds of random jumps for sure. I guess for now I'll consider this "resolved" since its most likely just the sensors doing sensor things, maybe try out some other options and see if there is one more reliable than these.

[pastel pebble]

if you're set up to be able to use matter over thread devices, another device to consider might be an IKEA TIMMERFLOTTE - they're cheap, update every 5 minutes, and are very precise. (tho i'm not sure how accurate/calibrated they are - you'll probably see some device-to-device variation.). You can also get a lot more control over the data and reporting by building something using esphome.