How to get correct altitude readings with changing weather/temperature?

Hi,
A bit difficult with the language but as I understand the summary says 15m and 0m as total ascent which sounds ok considering only a few meters up and down for each round? But the elevation profile starts at about 330m and drops almost 100m during the run?

I dont think that this is related to temperature. I often du runs with weather changes or temp changes (only going from indoors to outdoors create a large change in temp) but never seen an elevation change as yours.

Do you start/stop outdoors at the same place? Do you stop directly when done? 

I start and stop outdoors in the same place 

have you tried ticking correct the elevation and seeing what it corrects it to? If so does it make it more realistic?

have you tried a DEM calibration of your altitude (you will need to be outside)?

Where I live an run its pretty flat, with a couple of small short hills (perfect for some interval work - but not enough to dramatically impact elevation). On general my ascent and descent are under 20m and my starting elevation and finishing elevation are always within 5m of my actual elevation of 74m. Checking now watch shows 70m.

Have you maybe tried cleaning your barometric port. Are you making sure that your port isn't being impacted by heavy clothing covering it?

Failing the above would discuss with Garmin. 

I definitely have a bunch of clothes on me, it's winter - 10°, it can be also heavy snowy and windy conditions. 

I don't see how the initial calibration solves the degrading pattern issue.

These all leaves a question to garmin - if a barometric sensor is so heavily impacted by external conditions and provides such inaccurate results - why just don't provide the option of the GPS height reading? 

if you starting point is the incorrect altitude, at least making sure its on the correct altitude to start will give you more comfort.

Total ascent and descent will pick up any udulations - and they can add up after a while. PS - total ascent will never necessarily match total descent as those undulations may vary depending on which side of road/path you are running.

Don't have the issue you are referring to re issues with barometer impacting my altitude.

You do have the option to set your Elevation to altimeter only - so prehaps try that.

Note that wearing heavy clothes etc over your catch can impact barometric readings and can stuff up elevation calcs like this - might want to try setting elevation to altimeter only.

And don't forget post activity you can always correct your elevation details if you think they are out, but has to be done web connect (never seen this option on the app):  Go into your activity, and under your watch picture on the right hand side of the page you should see this option: Elev Corrections : Disabled

Change the disabled to enabled. It will then based the data on survery detail (note that you can't permanently tick this option on if your deivce has a barometric altimeter - so you would have to manually make this change for when it has gone wrong.

jaamgans said:

And don't forget post activity you can always correct your elevation details if you think they are out, but has to be done web connect (never seen this option on the app):  Go into your activity, and under your watch picture on the right hand side of the page you should see this option: Elev Corrections : Disabled

Change the disabled to enabled. It will then based the data on survery detail (note that you can't permanently tick this option on if your deivce has a barometric altimeter - so you would have to manually make this change for when it has gone wrong.

Thank you for the advice, but for real... The point of having 900$ watch is not to have these manual manipulations if they doesn't work correctly. So it's not helping.

jaamgans said:

if you starting point is the incorrect altitude, at least making sure its on the correct altitude to start will give you more comfort

My starting point is at correct elevation. Astana is at 347m above sea level. 

would try rebooting your watch. if that doesn't work would try a factory restore. If still no go would then raise with Garmin.

Hello.. I started to have the same problem. It was OK for one year and now, during last two weeks my watch started to behave same. Temp - 30, Alt - 230, those are correct. I start the activity, outside is 0 degrees celsius and immediately, in 1minute after the watch is on cold air,  my altitude ramps up +80 - 100m. If I point heat gun on them and warm them up a little bit, Altitude start to descend rapidly many meters per second. I know that pressure is temperature dependent, but for one year this was not a problem, the algorithm somehow corrected the temeprature drop. But now the altitude is extremely temp. dependent and the result complete nonsense. I just wanted to kindly ask you how you solved  your problem. Many thanks.