During summer, we usually do get more gigs.
During summer, it is warm. No school. Everybody is on a vacation. Everybody has a crapload of time. Which means there are more opportunities to play. Which is funky. That means, more gigs.
So yeah, usually there are more gigs during summer.
For example, during winter, it would suck carrying your drumset and amps and other crap during a freezing weather, ne?
Me like summer.