Could you explain the meaning of "crack"? Is it same meaning as "over"? And is this sentence a common usage example of the word "crack"?
Native speaker’s answer
Rebecca
When the speaker says "often cracking 30 degrees," he means "often reaching 30 degrees." In this context, we can understand "crack" as meaning "reach" or "make." It is actually quite uncommon to use crack in this way, and "reach" would be more likely used in these kinds of situations. "Crack" is usually used to mean "solve" or to "break" something. Ex: He cracked the hardest puzzle in the world. (Crack = solve) Ex: I cracked my favorite mug. (Crack = break)