are you seriously arguing that the location of KNAK (the US Naval Academy) has the same level of urbanization around it as DCA? What nonsense are you on about? Right now DCA is at 41, and basically all the PWS around it are reporting approximately the same temp (39-42F). It's low of 28F is mostly inline with the stations in Crystal City, Pentagon City, Rosslyn, downtown DC, Navy Yard, Old Town Alexandria, etc. It was only 2F warmer than my station that is 350+ feet higher in elevation (but still well within the urbanized area).
again, people would complain about the same nonsense in NYC when KNYC wasn't representative of their random-ass suburb somewhere in the middle of NJ. Sorry dude, it's not the station for your little town.