If you have an air conditioner plugged into a Wemo switch, it will automatically turn off when the outside temperature goes below a threshold.
If
Current temperature drops below
This Trigger monitors your local temperature and fires whenever the temperature drops below the value you provide.
Then
Turn off
This Action will turn a WeMo Switch off. If the WeMo Switch is already off, it will remain off.
Explore more great ways to automate Weather Underground and WeMo Smart Plug