Answer: yesterday, reached 155 degrees.
Explanation: a predicate is the part of a sentence or clause containing a verb and stating something about the subject. The complete predicate of a sentence includes the verb and all the words that tell what happened in the sentence. In the given sentence, the complete predicate is "Yesterday, reached 115 degrees" even though the word "Yesterday" is at the beginning of the sentence, it is indicating when the temperature reached 115 degrees (it is modifying the verb "reached"), so it is part of the predicate.