A primary or middle school teacher or an enthusiastic parent focused on hands-on, DIY science education for children, likely involved in a weather observation project or a citizen science initiative.
Quick, everyone, grab your thermometers!  I think—and I could be wrong—that the temperature plummeted unexpectedly; I suspect we'll need extra layers today, or even our warmest jackets, to stay nice and warm, and we need to note this significant change at once in our weather log.