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The demiplane spell creates a door that leads to another plane of existence:

You create a shadowy door on a flat solid surface that you can see within range. The door is large enough to allow Medium creatures to pass through unhindered. When opened, the door leads to a demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone. [...]

It seems that this room is the entirety of this plane. There is nothing beyond the ceiling, floor, or walls. In a sense, the ceiling is the limit of the "sky," although if it has weather is questionable.

Given all this, is the space inside a demiplane considered "outdoors" for the purposes of the control weather spell? Control weather requires that:

[...] You must be outdoors to cast this spell. Moving to a place where you don't have a clear path to the sky ends the spell early.

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No, you cannot cast control weather inside a room.

As you've quoted, your demiplane is a room made of wood or stone.

When there are no mechanical in-rules definitions, we generally go with the normal language. In this case, in normal language rooms are indoors, it's what makes them rooms. Being outdoors is not being in a room.

It doesn't matter that the entire demiplane is this room, it is still a room. The demiplane is not an entire world, just an extradimensional space.

Comparison to another extradimensional spell

This is similar to mordenkainen's magificent mansion, which also creates an extradimensional space. Both the room of the demiplane and the mansion from magnificent mansion are indoor structures. They aren't outside so therefore don't pass the gate required for casting control weather.

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    \$\begingroup\$ @user62688 I agree with NautArch here. "Being in a room" is literally the opposite of the meaning of the word "outdoors", I really don't know what else you expected here. Vice versa, if are in a room, you are indoors, not outdoors. I get where you're coming from; it seems like a demiplane should have its own sky and everything - but this is not the case in 5e. \$\endgroup\$ – PixelMaster Mar 30 at 16:22
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    \$\begingroup\$ @PixelMaster Well, it's not like I can't see that point of view. It's just that I can also see the opposite point of view equally. You have a room, and you can step outside the room into the outdoors. But if you have a room that is entirely a self-contained plane of existence, why isn't any point in that plane the "outdoors"? \$\endgroup\$ – user62688 Mar 30 at 16:28
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    \$\begingroup\$ @user62688 If you've got a competing answer, feel free to self-answer. \$\endgroup\$ – NautArch Mar 30 at 16:29
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    \$\begingroup\$ @user62688 look at it this way: there won't be any natural weather in your 30x30x30 room (be it a demiplane or a regular room), so there's nothing to control anyways. As the DM, I personally wouldn't let you cast the spell on the demiplane, or maybe at most with the temperature control, but not wind or rain. \$\endgroup\$ – PixelMaster Mar 30 at 17:38
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    \$\begingroup\$ @user62688 why isn't any point in that plane the "outdoors"?, well, because it is a demiplane which happens to be just a single room: its walls and its inside and nothing else. It says so in the spell description. Can you tell why you think there should be any "outdoors"? Is inside of a bag of holding (also a demiplane) also intuitively outdoors to you? \$\endgroup\$ – WakiNadiVellir Mar 30 at 18:56
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The demiplane created by this spell is indoors, but other demiplanes might have outdoors areas.

One of the most well-known demiplanes is Ravenloft, the Demiplane of Dread, which contains a wide variety of indoor and outdoor locations within its boundaries. While this spell is limited to creating a single room, similar spells or abilities from previous editions allowed the caster more freedom in how the demiplane was designed, and monster/NPC abilities don't need to follow the same rules as those of PCs; as a result, if a character were to find themselves in a demiplane that possesses an outdoors area (either as a result of its natural nature, or being designed by a creature that possessed the power to do so), then they would be able to cast Call Lightning.

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the door leads to a demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone. [...]

appears to be

Nothing states outright that the room IS the demiplane. This is an assumption made based on a description of a perception.

So for a purely rules based answer, you KNOW you are in a room, you do NOT know that there is not an 'outside' to this room, visa vi, you can only assume you are indoors.

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  • \$\begingroup\$ Couldn't you be in the middle of a vast outdoor expanse with illusory walls and ceiling around you? \$\endgroup\$ – Mohirl Apr 1 at 8:45
  • \$\begingroup\$ @Mohirl Honestly if I were a DM, and I got this question, my answer would be "Knock it off." Because that's the only actually reasonable answer to this question. But we passed the realm of sensible some time ago, so, we're now in the realm of nonsensical answers to nonsensical questions. \$\endgroup\$ – Iron Gremlin Apr 1 at 14:53

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