The question is WHEN are they more accurate, my weather stations and apps tell me as weather changes what it is, which I can usually do too by stepping outside.

The question is WHEN are they more accurate, my weather stations and apps tell me as weather changes what it is, which I can usually do too by stepping outside. But weather forecast (a prediction) I have not noticed it being more accurate and often wonder what changed, is it too much reliance on this real time data?