2007 Toyota Camry Outside Temperature Sensor Responding Very slow

The outside tempurature display takes more than an hour to adjust to changes. For instance, parked in the garage in the morning, it shows 63 degrees. Even while driving in 85 degree weather, it will show 63 or 64 degrees for at least an hour. After I park it for several hours and return, it will indicate the current temperature but then again changes very slowly. Is there a way to clean the sensor? If so, where is it located and how do I do so?

Thanks, Ron