Also the bird appeared after a short period of snowfall down to 400? m ...I don´t remember the exact hight, very low however... only the lowest areas near the river(open meadows and adjacent fields) where this bird appeared , were not covered with snow.
I didn´t refind him after he finally flew, and the next day snow was all thawed and birds were moving on.
However, I am still surprised how more reddish it looked, closer to a juv/ early first winter (it seemed to me more than on your link, CAU? Is that possible?