"When is it fine?"

"Wait a bit. The falling of the rain of course generates heat--"

"Why 'of course'?"

"I can't explain _exactly_, but you know perfectly well that it's always
warmer on a cold day after the rain."

"Yes, but not on a hot day."

"Yes, it is."

"No, it isn't."

"It is, really. Anyhow, this is a cold day."

"No, it isn't. You said it was very hot at A."

"I'm not going to argue. You must take it from me that rain generates
heat."

"All right. Is it fine then?"

"No. Heat being generated the air rises. The result of that is that there
is less _pressure_ at A--"

"Is it fine then?"