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Winter sale webpage was visible for a moment
(i.redd.it)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
You can check with steamdb for the past sales:
https://steamdb.info/app/631510/
Here it says the discount is always the same for the past year, so you can expect the price for this sales will be the same as the next. Though for some game they will have discount for one sales but not the other, and some only join in for the big 4 season sales. If the price is right for now, just get it.