I assumed that the weather comment was not about 25 being too hot, it was about getting the 'hot shift' too many times over the years while Collywobblewood never ever get it.
The comment seemed to be a prepared comment; he had his statistics to hand, etc. It was probably thought of before the weather forecast was even known. It could have been 32, and just bad luck it was 25. The only option seemed to be to wait for next time and see the weather then, which kind of leaves the comment unsaid for too long.
What he should have done IMHO is make the point that today is not a good example, but this just happens too often to ignore.