Why focus on something like that?<p>Any possible answer you get is only going to hurt your chances:
A. You are "too late" in the year- you stress out and lose focus.
B. You are "too early" in the year- you wait for the perfect launch time and lose focus.
C. You are "just right"- you feel successful too early and lose focus.<p>Seems like the wrong question to be asking.
Depends on whether your industry is seasonal, and how quickly you need to start turning a profit before you have to pack things up. Online retail (for me, anyway) was very slow in the summer and crazy around the holidays. If we had launched in late February, we'd have had a hard first six months or so.
I would be very surprised if this result is statistically significant. In a sample size of 11, it's not terribly unlikely to have 3 of them founded in the same month by chance alone.
I wonder what these dates actually point to? When a company was founded could mean so many things.<p>The summer can be a great time to develop and plan. If you're raising funding, from what I hear, the worst times are July-August and Dec. People take holidays, etc and you want to be timed for that.<p>But that doesn't mean you're not working? Build your product, get test users, etc. etc. Now is always the best time.
You really want to begin any startup during an equinox. That's when you can stand an egg on it's end without falling over. It's a magical time! But seriously, what a silly thing to worry about. It's like asking, should I serve Coke or Pepsi at my startup? Which will make me more successful?