We've become accustomed to presidential inaugurations that happen around the 20th of January, and the variety of mid-winter weather conditions that go along with that in the Washington D.C. area, but the history of the event and of the accompanying meteorological conditions is even more varied, since for a good while the traditional inaugurations were held in March instead, and there have been enough non-traditional inaugurations due to unexpected successions (by way of resignations, assassinations and deaths due to illness) that the noon temperature at the time of the inauguration has ranged from as cold as 7 degrees (!) for Ronald Reagan's big day in 1985 to as hot as 89 when Gerald Ford took over for Richard Nixon in 1974, which happened in August.
For today's ceremony in D.C., skies should be partly to mostly cloudy, with dry and seasonably cool weather in the mid 40s around noon and upper 40s for a high later in the day. If you'd like to see a nice compilation of Inaugural Day weather facts and statistics, along with some interesting stories about some of the worst weather experienced during the ceremonies and parades, and some of the unfortunate results, the National Weather Service in Sterling VA put an interesting web page together at the link you see above.
For us, it's one more day of mild weather for the MLK Holiday, then some much colder air pours in tonight and tomorrow in the wake of a dry cold front. Be ready to bundle up a little more for Tuesday and Wednesday!