I conducted my first successful Firefly Watch earlier tonight. By "successful," I mean that my watch was accompanied by fireflies, and not just by mosquitos. There were a lot of fireflies, too. In the 10-second interval, I counted about 20 flashes. An hour makes a big difference.
This is a fairly easy project to carry out, as it requires only ten minutes of observation time per week, plus a minimal amount of time to enter the data. So, give it a try.