Chapter 10: The Southern Coastlands: On the Subtropical Margin

Washington D.C. shares two major characteristics with the Southern Coastlands.

First, it also has a subtropical climate. Subtropical climates are generally characterized by long, hot, humid summers. In Washington D.C., summer temperatures range from the uppers 70s in late May, to the upper 80s in August. It is not uncommon for there to be heat waves, where the temperature can easily climb into the 90s and 100s. Humidity adds to the discomfort of the heat. Average July humidity is around 66%. (Source: http://en.wikipedia.org/wiki/Washington,_D.C.#Climate)

Source: http://pics2.city-data.com/w1q/lhaq3714.png

Second, Washington D.C. is also prone to hurricanes. Although usually not nearly as strong as those that hit the Southern Coastlands, hurricanes have been known to hit D.C. These hurricanes are generally the weak fallout of larger storms and hit anywhere from late summer to early fall. They have, on occasion, been fairly strong.

Source: http://media.nationaljournal.com/?controllerName=image&action=get&id=10927