The weather observed at BOSTON, MA (KBOS) at 02:54 AM EST was: The skies were clear. Temperature: 28F ( -2C) Dewpoint: 18F ( -8C) Relative Humidity: 64% Winds from the SW (220 degs) at 8 mph. Pressure: 1017.5 millibars. Altimeter:30.05 inches of mercury. The prevailing visibility was 10 miles.