During a large chunk of the hottest part of summer, Washington, D.C. achieved the unimaginable: it failed to hit 90 degrees.

For 18 straight days we avoided crossing the toasty threshold. But  the streak ended at noon today when the mercury hit 90 (and has since risen a few more degrees).

But to go from July 22 to August 9 and to only hit 90 once (today) was quite an accomplishment.

Related: Missing: 90-degree high temperatures in D.C.

Consider the frequency at which we hit 90 during this stretch in recent years (statistics courtesy Ian Livingston):

* 2011 and 2012 hit 90 on 16 of the 19 days in the stretch

* In 1999, we hit 90 on 18 of these 19 days

(Ian Livingston)

1996 is the most recent year we managed to go through the entire stretch without hitting 90 at all.

A new 90-free stretch about to start?

While we may flirt with 90 over the weekend, weather forecast models are advertising a pool of cooler than normal air to move over the eastern half of the U.S. by the middle of next week.  In other words, it may be a while before we see 90 again if we don’t get there this weekend.

Difference from average temperature at an altitude of about 1-mile high between Wed-Sun next week from GFS model (WeatherBell.com)

Ian Livingston contributed to this post