With a temperature of 90° at 2 pm this afternoon, Washington DC is right on the recent historical track for the number of days with 90° or higher temperatures. The 14 occurrences so far this July are exactly equal to the historical average and the numbers observed in each of the previous two years. Cumulatively for the season, the total of 22 is one short of the long term average through July and exactly equal to last year's amount.
With a late-season surge, including 3 days in October, the year 2007 went on to exceed the annual average of 37 by 7 days. The previous year, however, ended up with one less than the long term average.
CapitalClimate chart, from NWS data
The Bottleneck Years by H.E.Taylor – Chapter 82
16 hours ago