Early and late - either the time periods of morning and evening, or the sense that something will happen at some point (early or late, it doesn't matter - it will happen).
The temperature difference between morning and evening is large.
Tips
usage
Context determines meaning: 早晚温差 = morning/evening temperature gap (literal). 你早晚会后悔 = you'll regret it sooner or later (figurative/inevitable). The 'sooner or later' meaning carries a tone of certainty - it WILL happen.
