Check to see if there is a recommended day and frequency on the door of your controller. Ours has one. It also has a recommendation by month for what to use.
I have seen the wifi - weather recommendation often here. Unless you set up a personal weather station and use that for input, it seems silly. Rain is very often very local. Even if you use the your own station, you still may be watering just in advance of heavy rain, but you won't likely know in advance. KISS.
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