Not sure how I do it

I picked Park Days for our homeschool about a month ago; I went through a list of parks with playgrounds and bathrooms. Then I assigned the park a day and went through the end of August. I did all of this to encourage people to come out and say "HI" and get to know each other better. Well, it seems I have a great way of picking the only overcast chilly days.

Last week it was nice and almost totally sunny except Park Day which was overcast with a windy chill. A few of us did attend and I'm sure we will today also but I find it a bit amusing that the days that are Park Days at least start all overcast and windy.