Please explain

‘Cold starts’ or ‘cold is started’ or ‘cold has started’
What is appropriate?

They’re all at least slightly awkward to me. The second is worst because it implies something is starting the cold, an odd idea. We usually think of weather as something natural – something that happens without cause. The verb “start” itself feels a bit too active for a condition such as cold anyway, but I certainly wouldn’t use it in the passive voice. I would use “begin.”

The cold has begun.

“Cold starts” sounds like a general truth. Something needs to modify it even then, though. Whatever can happen must start in order to do so, so this idea has little value. “Cold starts in the fall.”

Thanks Mordant for your nice explanation.