Total count on those on the way is 20 (out of 106 total)
Here's a potential clue: It's the end of June. The kids are out of school. The weather was good. I'd bet the bulk of the voter families were at the beach or the mountains. That would be a good reason for holding the primaries in JUNE. Either that or the Election board was completely drunk and had a "Hold my beer and watch this..." moment when they picked the date.