If it's winter, I wear whatever I'm going to wear when I get there. Jeans or slacks.
If it's November or March, probably shorts (I favor hiking shorts), unless it's especially cold (below 50 F). Or if I'm going somewhere shorts would be weird.
If it's April-October, I wear shorts all the time anyway, except to work or formal occasions. For that, I'll bring pants along and change when I get there.

I live in Texas, can you tell?