Outdoor Temperature and humidity reading correction

[solidcell]

Just chiming in that as of 3.1.13 with an Open Air, the temperature reading is still quite off. I’m not sure what the expected accuracy is supposed to be at the moment. The temperature is really -11C right now but it’s showing as -4C. Yesterday it was 0C and it was showing 8C. So still quite inaccurate.

When we developed the two formula we did not have much low temperature data.
Are you depending on local outdoor temperatures to collect data in order to adjust the algorithm? It seems like you should be using some small refrigerators and freezers in order to simulate colder temperatures, especially if you aren’t in an area of the world that gets such temperatures, like a lot of your users do.

[Achim_AirGradient]

We are working on an update to bring the new custom calibration for temperature and humidity into the firmware so that it can be picked up by hone assistant. This will be in version 3.1.14 of the open source firmware.

[Kieran]

My outdoor unit consistently shows a higher temperature than what the “weather app” shows. However, it is on a small balcony, mounted to the concrete wall that no doubt carries heat well into the night after the summer sun has set.

Short of having the temperature sensors out of the case, and out of the sensor packaging, in exactly the same conditions as each other being mindful of any slight breeze from a warmer or colder surface, I’m guessing it might be very hard to get a highly accurate and correlating measurement.

In my view, This is different to a PM measurement because if you consider the air inside a room, even if runs over a hot or cold surface it shouldn’t considerably change the density of the PM in that air. Unless the surface collects, or absorbs, PM - but that’s a whole lot less likely than a surface that can affect air temperature.

I might be way off on this, but it does seem logical?

[Nainokami]

Here are 3 sensors measuring the temperature, all on the north side of my house or garage. The Netatmo sensor is within 30 cm of the Airgradient outdoor sensor. The sensor in the ComfoAir is pulling air from an outside vent at 210 m3/h so should be completely independent of shade/sun. It is also cloudy and gloomy outside, so the sun shouldn’t have any impact.