What about the temperature ?

I've always found my garmin reports lower when moving on a cold day by 2-3C and higher if in the sun. 

Weather forecasters use sensors in the shade, out of the wind. Feels like temp is meant to reflect wind chill and sunshine, which is what i find my Garmin does. That said, i have not compared what my 830 did to what my 1040 is doing. 

I've never paid much attention to it anyway as it takes too long to get to the real temp after leaving my house and goes off the charts high if left on the sun at a cafe, again taking time to return to real values once moving. I dont think there is any magical way to resolve this other than using IR sensors

The temp sensor is part of the altimeter sensor to get an accurate air pressure. Don't see how it could be that different from the previous generation. Though they could use the solar energy to calculate how much thermal energy to subtract from sun exposure to help a bit

I do not understand the Garmin people. It would be so easy to let the user set an offset. 90% of all complaints would be gone - (even though the temperature deviation is much more complex - and doesn't bother me...). I suggested this to the beta team years ago, but no, they don't do it.

As I said, it is in fact complex. You can't expect a device that is exposed to wind, rain and sun at the handlebar to display correctly.
But most users claim "mine shows 4 degrees too much", "mine shows 3 degrees too little". All these users could be satisfied.

And then all the people who see an offset option and start complaining when they realize the temp is wrong, or complain because the offset doesn't help fix it.  Adding extra complexity that doesn't do anything to solve the issue won't really help

Never had temperature accuracy issues here.

Why not. That's how Garmin usually operate. They add extra complexity to their units rather than ensuring that base functionality works correctly.

The temperature recorded is the internal temperature of the barometer chip. It is needed for correct barometric readout. 
I never understood why Garmin gave us access to that data. It’s like they decided to record compass heading in the .fit file. 

The temperature in the weather widgets on the x30 series is from the nearest airport, no matter how far that is. This seems to be an relict  in their software from really old days. The weather data in their watches is from another source, I don’t know wich. 

The weather data afterwards in the Connect App/web wich is shown when you view the activity and wich is used for the badges (and i think heat acclimation calculation) is again from another source. 

So, let’s just leave Garmins temperature readings what they are and look at an thermometer (in an useful spot). Even the Tempe suffers from drifting if you attach it somewhere we’re sun is heating it (on your shoe when running, on your backpack when hiking) or heat blockage is a problem (in the free space between the carrying system of a backpack and your back for example). 

An Edge device can not display temperature data from the Tempe without using the Tempe Visualizer?