Today ( April 17 ) I left my trailer expecting the usual roasting sun and temps - we had a steady climb into the 90s last week . Instead , I found this : The temperature must have fallen 20 or 25 degrees overnight . It is quite pleasant . The dust has an odor that 's not completely an odor : it 's like walking into a woodworking shop where someone is using a very fine grit power sander .

Question: What may have caused the weather to be pleasant ?
Answer: The temperature was in the pleasant 90s .It cooled down to 20 degrees .It cooled down .None of the above choices .