noun
BAD : The mood of the castle depends on the weather.
GOOD : The atmosphere of the castle depends on the weather.
DUBIOUS : The streets were very crowded and had a holiday mood.
GOOD : The streets were very crowded and had a holiday atmosphere.
GOOD : The streets were full of people in a holiday mood.
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mood = the way someone feels at a particular time, such as happy, angry, etc: 'I'd keep clear of George this morning - he's in one of his bad moods.'
atmosphere = the general impression that a place gives you: 'Their house always has a warm, friendly atmosphere.'