This is true in most of the world. If you want to know what the weather may be like on a certain day, you’ve gotta wait until 2-3 days beforehand for a forecast to be accurate. This is especially true in winter in America in the East. Several years back, my forecast was for a low of -19 one day and I was appalled thinking all of our trees would die. The actual low that day was 18 as the polar vortex actually settled west down into Southern Texas.
That’s why I’m still saying, a week out, the temperature for the game could be anywhere from frigid to comfortable.