We continue to work in light precipitation as long as the temperature is above 32 degrees. The Super Water that we use to clean your windows does not leave any residue behind, so in our experience it is rare for rain or snow to affect the windows. If it does happen, you can rest assured, we offer a 5 day spot free guarantee! If rain spots up your windows within five days of service, we will come back and touch up as needed at no cost to you!