Thanks; that's what how I thought the Rachio was supposed to work, but I wasn't seeing changes in watering times. I'm watching more closely now, but what I'm seeing is puzzling.
For example, I have a few emitter zones. Two of them weren't adequately watering their plants, so I increase both zones to 150% on the "Duration" screen. Since I made that adjustment, it has gotten cooler. I just checked durations again, and one of the zones is still showing 150%, but the other had reduced to 120%.
Is this the mechanism through which weather based adjustments are made? If so, then why did one zone remain unchanged, and the other decreased to 120%?