The Ratway Passages mod connects more areas of Riften via its underground. You can now access Beggar's Row, the Hall of the Dead and Riften Jail and more via The Ratway. Skyrim modding is as ...

I'd recommend watching the full video because it's fantastic, but if you just want the end results, Riften is the warmest city in Skyrim by a considerable margin and Winterhold is the coldest.