I tried to grow salad greens one summer; ended up shepherding them in my shower under the skylight. Didn't come out great, but I did get some lettuce in a bite or two of sandwich and salad. Terrible summer crop.
However. It has taken me a long time, as a novice vegetable gardener, to learn that lettuce hates summer. Too bad for BLTs.
I'm not much of a winter gardener. At all. If it's raining, I'm complaining.
Happily, I've learned from El at Fast Grow the Weeds that lettuce is excellent in winter.
And, at my house, oranges are excellent in winter (though they will continue to get better all the way into summer). And lettuce, though I'm too stupid to grow my own seasonal crop, is luscious.
Here's a salad made from supremes of local (LOCAL) oranges, confit of chicken legs, homegrown red onions, and tender winter lettuce (purchased, but probably not next time... greenhouse?).