I hesitate to speak for someone that I don't even know. I'll assume that he means that in aggregate, the remainder of the month will be well AN. Your point is certainly thought provoking, and I guess opens things up for personal perception. I would not classify a low of 30 or even in the 20s in December as "cold" but again, that's me. The normal low at MU for the remainder of the month ranges between 22 and 26 degrees, so a temp of 30 is fairly significantly AN. If it was 30 on the morning of 10/14, I'd say it's cold. To me, the time of year matters greatly in my own perception. 75 in February is incredibly warm, 75 in July is delightful.
Interesting how all of us are unique in our own perceptions.