Literary point: if you are good, it will be sunny.
Conditional adverbial clause: the adverbial clause guided by the leading word if or unless is called conditional adverbial clause. If-guided conditional sentences include true conditional sentences and untrue conditional sentences. For example, if you fail in the exam, you will let him down.
Conditional adverbial clauses are adverbial clauses that express the conditions of the main sentence action in complex sentences. Like most adverbial clauses, the most important thing to master conditional adverbial clauses is to master conjunctions, but before mastering conjunctions, you need to have some basic understanding of conditional adverbial clauses.