After living in our house for the last 9 months, I have learned to not touch the seasonal adjustment setting on the irrigation control.
Just set the duration time on your sprinklers for whatever you want. We use 45 min for the grass and 25 min for the shrubs.
Monitor the seasonal adjustment setting. If the weather gets hotter, the setting will increase by itself and the duration time for you sprinklers will increase proportionally. When it gets colder, the setting will lower by itself and the duration time of your sprinklers will decrease.
From my experience, it is useless to change the seasonal adjustment setting. If you change it today, it will revert back tomorrow by itself.
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