https://skyrim.nexusmods.com/downloads/file.php?id=11163This is a realism mod which in my opinion adds a lot to the game, and something I'm surprised they didn't include in a hardcore-mode. It is an amazing mod for improving immersion, especially together with some other mods I'll suggest. The mod adds cold effects amongst other things, and you need to consider this when traveling. Wear warm clothing and a cloak, make a campfire, use torches etc - any heatsource helps, to various degrees. It is very complex but also very simple to use and very customizable. As far as I am aware, it is compatible with just about everything except other hypothermia mods. One note though, quoting from the mod description: What this last part means is that if you use Frostfall, disable the Get wet esp from WATER, as it is built into Frostfall anyway.