I have a very simple program that sets a variable if the average temperature drops below 5c. I use this variable to run or not to run programs. 

 

If module 'climate' average temperature <=5c 

 

I'm in Montreal Canada and we are in the middle of the summer and the average temp doesn't go anywhere near 5c , but every night this program runs and sets the variable wrong. 

 

Does it run at the same time every night?  If so, perhaps this might be a clue as to the cause.  (Specifically, I wonder if ithis is being triggered by a nightly query or some other programmed event.)

Can you post all the related programs.

 

Where are you getting your temperature data from?

I attached  some pictures.  Hopefully these answer your questions. 

I attached  some pictures.  Hopefully these answer your questions. 

 

Are you using a state variable or an integer variable?.  A program can only be triggered by a state variable.

 

Take a look at your variable to make sure it's properly initialized.

 

Being that your weather data is coming from Montreal Airport is should be reliable. You might want to take a look at your error log to see is there's any HAM Weather related errors.