The foot traffic through the neighborhood varies wildly from one year to the next. There are usually events where kids attend in costume that reduces the number that might go door-to-door. When my two were little we went to the "Boo at the Zoo" one year in costume - it was so hot that evening that most of the little ones were reduced to walking around in shorts and t-shirts while parents carried the too-hot costumes. Recreation centers and churches have events. I've also had cold freezing winds on Halloween. This is a nice evening, it'll be in the 50s, so I expect to hear a few walking past the house. I leave all of the lights off and retreat to the back of the house because the costumes and knocks on the door are nerve-wracking for the dogs.