yeah last night was the type of night that maximizes the difference between the urban areas and elsewhere. Very little wind, which means for us, we get the initial drop in temps after sunset of a few degrees and that's it (no radiational cooling). Meanwhile, once you get away from the city a bit, you get more of that radiational cooling and temps still plummet.
The night before we still had the fresh northerly wind bringing in the goods so everyone got cold af.