その日その日で天気は変わる。

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

day; days; sun; sunshine; sunlight; case (esp. unfortunate); event

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

weather; the elements; fair weather; fine weather

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to change; to be transformed; to be altered; to vary; to move to; to be different; to be uncommon; to be unusual