I guess so -
I spend hours every week along the river. A normal week, my wife and I probably spend 10-15 hours on the river trail that winds from the water's edge to at points a couple of hundred yards away. It is not uncommon at all on certain days to walk in and out of "hot spots" and "cool spots" where we look at each other with that knowing glance that we just experienced a significant temperature drop, almost like walking through an invisible curtain separating warm and cold. It's a neat thing to experience and like I said, it happens several times a year, and when it does it is very noticeable. Can't get down to the trail today but I wonder if this is one of the times when there's a large variance from one area to another.