1.Frostfall (Now in steam workshop!!)
(http://www.nexusmods.com/skyrim/mods/11163/?tab=2&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fmodfiles%2F%3Fid%3D11163&pUp=1)

Basicly Its the main mod Comes with crafting camping tents Rain and cold Effects Etc..
and its very easy to use

2.Wet and Cold
(On Steam Workshop)

Makes its so if your in a colder part of skyrim frost can form on you're Armor
And makes rain more real at the same time by making it fall off your Player
And extras for NPCs

3.Wet and Cold Holidays
(On Steam Workshop)

Addon for Wet and Cold That Adds Holidays

4.Rest for the Wicked
(On Steam Workshop)

Makes it so your player will need to rest

5.Realistic Needs and Diseases

It adds needs for food, drink, sleep and a drunkenness thing. Also makes diseases more persistent and serious.
(recommend By Kev In his words)

More Blood and Gore
Add more blood and gore in fighting
(Recommend by some guy on facebook)

I know there is more mods i have missed so please tell me if you have any more that are helpfull I will try them and maybe add them and your steam Id with them
Thank you.