Agreed, the air temp and the ground temp can be a few degrees different, but the high temp during the day also has to be taken into account. You also have to have certain temps for the ground to freeze to any depth, as it has been said tonight 99% of the ground took a stud and the temp rose almost straight after the inspection as the weather front came in.
I could take you to separate areas of my lawn, one which is in shade 90% of the day and is frozen, go 6 feet to the side the lawn is soft because it has had the sun on it during the day. The area that was frozen is softening up as the temp has risen.
A little bit of thought and a look at the weather for tonight could’ve seen that game played no problem.