The weather observed at NYC/LA GUARDIA, NY (KLGA) at 02:51 AM EST was: The skies were mostly clear. Temperature: 37F ( 3C) Dewpoint: 23F ( -5C) Relative Humidity: 56% Winds from the NW (320 degs) at 14 mph. Pressure: 1023.1 millibars. Altimeter:30.21 inches of mercury. The prevailing visibility was 10 miles.