Out here in San Diego, it has been cool at night (high 40's, low 50's) but I went ahead and put a bunch of stuff in the ground a few weeks ago.
It's high 60's, low 70's during the day with plenty of sun after the marine layer burns off around 10 or 11am.
I have a selection of herbs (basil, thyme, cilantro, parsley, oregano, savory and tarragon) planted as well as a few varieties of tomatoes and serrano, jalapeno, green bell, yellow bell, habanero, cayenne and poblano in both pots and in the ground.
My chives finally sprouted indoors yesterday.
This weekend I'll probably be starting a few more pepper seeds I just received as well as putting some lettuce, onions and a few more things in the ground.
Most of the stuff is just surviving, not really taking off because of the cooler soil temperatures but they'll be going like gangbusters here shortly.
Sometimes I really love living in Southeren California