I've been wondering, because May and June ended nearly 4" below average here. It's been great, but definitely dry. Yesterday we were expected to hit 85 or 86, but popped up to 88. In Pittsburgh it is unusual to overachieve on summer temps. Usually if we are forecast to hit 90 or 91 we usually stop at 88 or 89. Yesterday we overachieved by two degrees, that's odd. Conversely, though, today was supposed to be around 86, but looks to fall short a few degrees.
Having nearly 10 straight days at 90 to 91 seems kind of implausible since it is so consistent, so was wondering if maybe they are underestimating some of these highs.