听力原文：It' s now 6 o' clock, time for Riley radio's hourly weather report. If you're just about to leave your house, don't forget to take your umbrella with you. The drizzle is expected to start throughout the morning, so prepare to protect yourself. However, the sky will clear this afternoon, and the temperature will be just 18 degrees Celsius. It will be a much cooler day tomorrow with a high of only 7 degrees, the coldest day in several months, so you' II definitely need a warm coat when you head out in the morning. That' s the morning weather report on Riley radio. Now, back to our regular pop music program. How often does this report air?