Summer averages about 1-2 foot, winter probably averages 3-4 foot. I went out today for the first time in a while, and it was fun for the fact there's been no waves. It was really choppy but there was some size to them, and if you picked the right wave, you can get a pretty good ride.
I just went there for the first time and theres tons of jetties which makes pretty much anything rideable. It was bellow knee high and i was out. I think it was the ninth street jetty i was at and it forms an 'L' on the beach. Pretty cool