C. Howard Nye
Chairman of the Board, President and Chief Executive Officer at Martin Marietta Materials
Kathryn, thanks for the question, too. So look, if we're looking at really what the drivers are, clearly, what we're seeing relative to average selling price is the single largest driver that we have right now. If we're looking at Q2 in aggregates up 18.6%, a really nice performance, obviously, in cement. We talked about that over 20% ready-mix, tracking the same thing.
These are all important points relative to the revised EBITDA guidance. And it does give you a sense that in today's world, pricing is actually considerably more powerful than volume is. And I think that's, to me, in so many respects, part of what's important to underline. To that end, if we're looking at the volume and we're seeing what some of the differences are, several things are worth noting.
One, relative to volume, we think in the quarter, we lost about one million tons simply due to weather. If you were here in the Mid-Atlantic, what you saw is the second half of June was, frankly, a washout. It rained nearly every day. So when the Carolinas and Georgia are feeling that, we feel that on volume. I think importantly, too, if we're looking at value over volume and what we think that cost us relative to volume for the quarter, we think that was probably about one million tons.
And by the way, we think that was probably a pretty good trade. Equally, if we're looking at what Jim and I both spoke to in our prepared comments, and that is with respect to the residential market. Again, we think housing itself has found bottom, but we tend to lag in that on the stone finds us waiting new subdivisions. So we think we're actually troughing in that as we sit here probably today going into the third quarter, we think that probably cost us about 0.5 million tons.
So again, if you're looking at what the drivers are going to be, will price be the disproportionate driver? Yes. Have we given up some volume on occasion intentionally and purposely because we feel like really holding firm on some of the pricing that we feel like is fair, is the right thing to do relative to our shareholders? We do. And then to the last part of your question relative to how different markets look, here's what I would tell you.
The Southeast remains strong. If we're looking at the Carolinas, if we're looking at Atlanta, if we're looking at coastal markets in the East, they continue to be quite good. If we're looking in Texas, in many respects, the results speak for themselves. But in particular, Dallas-Fort Worth in the North and Austin are strong. San Antonio and Houston are feeling degrees of residential weakness.
I don't think that's a surprise any place. If we're looking at Colorado, Colorado had a very wet June, as I mentioned, it was the wettest June on record. But if we're looking in California and Arizona, here's what we see, really strong demand in Phoenix. We see strong demand in Southern California. The places that are a little bit weaker, it's a little bit weaker in San Francisco Bay Area.
We thought it would be coming into the year. It's a little bit weaker in portions of the Midwest. Again, that's a cold weather market that in many respects, it's just starting to hit its stride right now. But modestly weaker there. But overall, if we're doing a heat map across our markets in the United States, given how intentional we've been in building our business in areas that continue to have good population inflows, very good public spending and good private growth.
We're seeing better markets than not. And again, that's not a big surprise to us, Kathryn. So again, I think I hit the points that you wanted to be raised, but I hope that helps.