I’m not so sure…
Reading Rachio’s FAQ’s on Flexible Monthly schedule, it clearly states
Seasonal Shift is not listed as an option under Flex Monthly Schedules, as this feature is automatically “baked in” to the schedule and is responsible for how your watering adjusts to fit the current season.
and lower down it states
Your bucket empties over time due to a variety of factors which are primarily driven by the weather. Based on 30 years of weather history in your area, we can determine how quickly, on average, your bucket should empty for each month.
What Rachio frustratingly don’t make clear is that IN YOU AREA only applies to USA and Canada - they don’t have data for anywhere else so it won’t work! I think this is one of the main reasons they don’t officially sell or support the product outside USA/Canada.
I have programmed mine to use fixed schedules as that’s all that I think works outside USA/Canada. So not really any better than my old Hunter controller, except that I can amend the watering times remotely, which has been very useful this year with Covid-19.