Joe,
What do you So Cal folks consider cold?
I'm used to the big temp. swings here in Colorado. My commutes in the mornings have been in the 20's and the ride home in the mid 50's.
Did a trip on the KLR last year in June. Was in the 50's when I left Parker, in the upper 70's when I got past Pueblo, and in the 30's with raining/snowing going over Cordova pass in the Spanish Peaks. All this within ~250 miles but ~4000+ ft elevation change.
I have rain gear and few sets of gloves on the pack list. Jacket with a removable liner as well.
Rojo