@bigbiggreendog , I think that we may just be saying the same thing in different terms, so I'll try to be clearer.
The short answer is: Water Budgeting is the software that changes your schedule, every 2 weeks, as weather conditions change. With the new weather service changes, it should work better than before.
Here’s the long answer:
New weather service or old, we use weather data for three things:
1) Auto Scheduling - the software recommends a duration and schedule (like "22 minutes, 3x a week") when you create watering times, based on the weather data for your location and what you've told us about your zones.
2) Weather Intelligence - about 15 minutes before each watering time is scheduled to run, your Iro will pull a weather report for your area and decide whether to skip watering this time. This doesn't change the schedule.
3) Water Budgeting - every 2 weeks, your Iro pulls a weather report (including average temperature, precipitation, and wind speed), for the previous and upcoming 2 weeks, and compares that with how that weather snapshot looked 2 weeks ago. Based on the weather changes (as well as some other factors like length of day), your Iro will change the watering schedule durations. For example, if the average temperature has gone down by a few degrees in the last 2 weeks, and it's expected to go down a few more in the next few weeks, the schedule duration might be changed from 22 minutes, 3x a week to 15 minutes 3x a week.
So, Water Budgeting (aka seasonal adjustment) is the mechanism to get your schedule to change as the weather changes. That means more water in June than in December, but it might also mean cutting back on the water in July if you're expecting a rainy couple of weeks (I know, not likely in California lately).
What, exactly, did we change recently? We changed to a better source of weather observations, which look back, and forecasts, which look forward. Previously, we were using 30-year averages (I said 3-year above, sorry) to look back: "how much does it usually rain this time of year?". Now we get actual recent weather observations:"exactly how much did it rain yesterday?". Additionally, the weather forecasts are better because they have a lot more local weather data to use when putting the forecasts together.
So, you should get better results from the improvement in the quality of the weather data, but you still need to let Water Budgeting update your schedule as the weather changes.
Does that make any more sense?