Here is a simple project which can turn your front yard / porch Christmas lights on automatically at dusk and can set them to flash when the temperature drops below a set point. You can build this simple project in just an hour or two.
(https://savagecircuits.com/wp-content/uploads/2013/12/ChristmasLightControl-00.jpg)
CLICK HERE TO GO TO THIS PROJECT ON THE SAVAGE///CIRCUITS WEBSITE (https://savagecircuits.com/christmas-light-control/)