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The basic principle of the astrolabe is the measurement of angles; that's all it does. Weather doesn't really affect it.

HOWEVER.... if you are measuring the visual angle between two objects, you have to be able to SEE both objects. So when used for celestial navigation or cartography, weather often plays a part, by obscuring your view of one or both objects. In celestial navigation, the "objects" are the star or planet whose altitude angle you want to measure, and the line of the horizon. In cloudy weather, you often can't see the Sun, much less any of the other objects in the sky.

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12y ago

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