Answer:
The sentence above is a compound sentence.
Explanation:
A compound sentence joins two or more independent clauses with a coordinator such as and, for, but, or a semicolon. An independent clause is a sentence that can stand alone as a sentence as it represents a complete thought. In this case, the two clauses have been joined by the coordinator "so". "In the winter the temperatures dip below zero" is one clause and "so many people vacation in the warmer climates" is another one.
