Leomund's Tiny Hut states:
The hut also provides protection against the elements, such as rain, dust, and sandstorms.
...
Although the force field is opaque from the outside, it is transparent from within. Missiles, weapons, and most spell effects can pass through the hut without affecting it...
Most spell effects can pass through the hut without affecting it...
What about supernatural weather, as described in Frostburn, etc? Would that fall under "protection against the elements," or would it fall under "spell effects?"
More to the point as it applies to my situation. The underworld of my game world is constantly shrouded in chilling mist, identical to a Kelgore's Grave Mist (PHB2), including allowing Spell Resistance to protect against the fatigue effect. It isn't a spell
per se, but it generally operates like it is. However, it doesn't flow into buildings or caves; it is just outside, aboveground.
So, would you allow Leomund's Tiny Hut to protect against that?
I probably should, as my Players have been agonizing all week, as they went to this plane completely unprepared, and were in danger of dying when their resistance to cold spells wear off (before they have a chance to rest and prepare spells to deal with the environment they now find themselves in).
Also, if it makes any difference, the Tiny Hut will be made via Shadow Evocation. I presume that they can all willfully fail their Will saves, and the Tiny Hut will function in all ways like the real spell would have.