What is the woman waiting for?

M: Excuse me. Have you been waiting long?
W: Twenty minutes already.
M: Did you notice whether the No. 7 bus has passed by?
W: Not while I’ ve been standing here. I’ m also waiting for the No. 7 bus myself.
M: Good. Hot today, isn’t it?
W: Yes, it is. I wish that it would rain and cool off.
M: Me, too. This is unusual for March. I don’ t remember it ever being so hot and dry in March before.
W: My mother and I have just moved here from Indiana. It is pretty cold there.
M: Yes, I’ ve heard of that.
W: Do you think we’ ve missed the bus?
M: Take it easy. It never comes exactly on the half hour like it should.