The ISS orbits the Earth every 90 minutes or so. Each time it does, it passes further to the west than it did on the previous orbit, as the planet turns underneath it. It orbits in a north-south or south- north direction, not at a particular latitude.
When you see the ISS, you see it because of the reflected sunlight. Because it's a couple hundred kilometres up, this means that you can see it for a couple of hours after sunset, and a couple of hours before sunrise. You can't see it at other times of night because it's in the shadow of Earth, and you can't see it during the day, of course.
So, the satellite passes within your view fairly often, but it's only during those brief windows in the evening and early morning that you can see it. There will be times (usually several days in a row) when it happens to pass in your view during that evening time, and other times when it just misses being in your view at that time. The same for the morning viewing times.
It doesn't depend on the season. Are you using an iPhone app to get the viewing times?