How to make sure your irrigation system doesn't run when it's freezing?

You don't want to wake up to an ice skating rink so...if you water your lawn into the winter months you need a Solar Sync or a rain freeze sensor which both prevent watering below certain temperatures. The Solar Sync will also use weather data to control the watering and thereby save you money. The Rain Freeze Sensor will to by just preventing watering during rain or while the sensor is wet.