https://w1.weather.gov/obhistory/KDCA.html
Weather Observations for the past three days
NOAA/NWS
Weather table includes date, time, wind speed and direction, visibility, weather, sky conditions, air temperature, dew point, 6-hour maximum and minimum, relative humidity, wind chill, heat index, pressure (altimeter/in), pressure (sea level/mb), precipitation (in. 1 hr, 3 hr 6 hr)
3 DAY WASHINGTON/REAGAN NATIONAL AIRPORT KDCA
https://w1.weather.gov/obhistory/KDCA.html
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Surface Observations Map
Includes, radar, 3-day weather history and more.