Waves can often be choppy because of the wind. And then theres two kinds of swell: wind swell and ground swell, which can make a difference in terms of how many waves come in a set and how consistent the waves are and yea.
Sit and watch and see and it makes sense.
This is important because it can make a difference to the conditions that you choose to go out in. Everyone finds it tricky to get out back when there's messy chop and the period between waves is really short.
Also, you will notice a lull between sets. Usually there are a whole lot of bigger waves then a bit of a gap between...surfers will always be looking out for these so that they can paddle like F and get the hell out the back quick as.
So I'm saying you need to pick your days and learn to read swell maps and also learn to read waves. Time and experience a. Oh, and then come back and teach me. ok.
Also also, I used to go out whatever the weather because I knew I was building my paddling fitness. This makes a huge difference when you're trying to get out to them nice ones out back.