That is a given.....I always dismiss that and make a deduction based upon knowledge of local climo. They will also often try to place the coastal gradient at like MHT, or KCON, which is of course absurd....its going to be near KLWM, and often times can be the demarcation between 33* air and 19* air, however its still modeled as 27 vs 33.
Even mesos just don't have the resolution, though they are improving. This is where experienced forecasters earn their money....or experienced weenies like me earn their 200 blog hits