When I started volunteering with Rebuilding Together, they told me that they didn't do ramp projects during the summer. That was fine with me - I really don't enjoy working in 105+ temperatures, but the reality is that the need continues, so I committed to an August Saturday project.
One group put in a paver walkway.
Thankfully, I think the weather is going to start to break. By the time we get back from the Green River, temperatures should be much better.