Volcano Deformation

Dear step forum, @thho @ABraun @mengdahl @marpet
l am doing PSI and SBAS analyzes in a 6-year time series on a volcanic mountain at an altitude of 3500 meters.
The top of this volcanic mountain has snow 8 months of the year.
That’s why I was undecided about the image selection.
I’ve looked through the literature but no one talks about it. There are general expressions such as 2014-2020 in the studies.
Do you think I should use (less) images with no snow or should I use all the images obtained ?

You should at least pre-process all the images so you can use everything later if you want to. The top of the mountain will be decorrelated for most of the year but the rest of the mountain will still give a result, even in winter.