Check engine light comes on when the weather gets cold

So I have a 2004 Ford Taurus SE and I bought it around a year ago. Now, every time the weather gets below around 50 or so the Check Engine light will turn on. But when it warms up to 55+ it'll turn back off. I use the system check in the car with the buttons and it says everything's okay. It'll probably shut off in 2 or 3 days, just wondering what's going on and how to make it stop?

Auto Zone will test it for free. Maybe it is a sensor.

Until you get the computer trouble codes read, you're just guessing. Get the codes read.