Hi Hufty,
I live in Central Florida, and what fdf and Tr4A say are correct. It's hot and humid in June and July, and it's the "wet" season, so you will likely have some days when you will be forced to change your flying plans due to weather.
However, as TR4A says, many times these storms are isolated, and they don't tend to remain in one particular area too long (they either move or fall apart), so you can often conduct your flying at a safe distance from the storms.
If you must do your hour-building here in June or July, it can be done; just allow some extra time. (And drink lots of water!)