It's definitely been a slow summer. Mine have a pretty broad range in size so far, they look a lot like yours. Here's the biggest and the smallest, only doing 4 this year.
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When I look at pictures from this time last year they were a similar size to the bigger ones I have now, but they were started about two weeks later. It'll be interesting to see how much size is lost with those two weeks of non-growth. Luckily nothing is riding on this one for me, whatever comes of this grow is just a bonus.
This week we're supposed to see some days in the 90's, I think the high yesterday was 62º. This has been some messed up weather.