Microclimates are funny things. As are slow-moving storms. On Sunday, I had some errands and then needed to stop at the grocery store on the way home.
The store we shop at is 1.8 miles from our home---a four-minute drive. It's way less than that in a straight line, but there are twists and turns in the streets between.
When I walked out of the store to the car, it was bright sunshine. When I got home, it was a downpour with lightning and thunder. It was like someone drew a physical line midway through the drive---dry and sunny on one side of a street, a rainstorm on the other.
The L.A. metro is a HUGE geographical area, and it's easy to joke that there are only so many ways to say "partly cloudy and 72", but odds are if that's the downtown temperature, it's 64 and foggy in Santa Monica, and sunny and 85 in Burbank. Pre-taped strikes me as a bad idea in that place.