Rain Delay is a manual control – it stops the controller from watering for a specified amount of time. Rain Sensor requires installing an external rain sensor, and it stops the controller from watering when the sensor detects rain. Weather-based Adjustment makes use of real-time data at your nearby weather stations, and automatically calculates a watering percentage that combines not only information about rain but also temperature and humidity. Although these three features are conceptually related, they are independent. See the chart below:
|Stations (except those that ignore rain) will stop watering when the sensor reports rain.
|Rain sensor has a built-in mechanical delay, adjustable by opening/closing evaporation vents on the sensor.
|Stations that are stopped, or scheduled to run during the delay time will NOT restart or resume after the delay time is over.
|Manual. Stations (except those that ignore rain) will stop watering during the specified rain delay time.
|Specified by the user.
|Water time is scaled by a watering percentage value (0% to 250%), updated every 15 minutes.
|No explicit delay time. Water time may decrease (<100%) or increase (>100%) based on weather.
|Accuracy depends on the proximity of your closest weather station.