So what gives?
Well the NWS puts its sensors in locations away from re-radiated heat. Sensors are solar-shielded and located at least ten feet away from trees, fences, buildings, concrete and asphalt.
Bank thermometers are usually inside a metal case which sit in direct sunlight. So the temp inside the box often gets hotter than the actual air temp.
All cars are not the same, but most car thermometers contain basically the same ingredient as a sophisticated weather station: a thermistor. However, these sensors are close to engine heat as well as re-radiated heat from the concrete and asphalt roads.
Sometimes people mount their thermometers on there roof or in direct sunlight, which is another reason you may have an inaccurate reading.
So it's fair to use your car and the bank to get a ball park reading, but it's probably best to trust the National Weather Service if you want a true reading. Here's a link to the conditions at the local airports.