I live in central Florida and my lawn needs 1-1.5" of water a week. The default rain skip threshold when I installed the device was 0.125". That is extremely low, especially when considering the rachio was not scheduling itself to deliver 1.5" of water a week (using all the recommended settings). To me, it seems that if I need 1.5" of water, and I can only water 2x a week, the rain skip threshold should be .75".
I’d miss entire days of watering just because it lightly sprinkled, and my lawn was getting about 1/5 of the water it needed.
The threshold should take into account the area you live, the amount of water your lawn needs, and the amount of time the rachio is scheduling itself to run. Without these metrics, the rain skip threshold seems to be more dangerous than useful.
I understand it’s very easy to go tweak this setting myself, but I purchased the Rachio because it was supposed to be smarter than me when it comes to lawn watering. Overlooking this setting, especially when it has all the data it needs, is a huge gap and makes me feel the system is not any better than the “dumb” Rainbird sensor I replaced.