June is optimal time for ISS viewing

As Earth approaches the June Solstice, viewers in the northern hemisphere will be treated to multiple passes of the ISS every night. The space station orbits the Earth at a 51.6-degree angle to the equator. This orbit aligns it with the planet’s day-night terminator, meaning for viewers in latitudes between 40 and 55 north, it remains in sunlight during the entirety of each 90-minute orbit. Viewers in these locations can see up to five passes of the ISS each night at this time of year, but only for a limited time. By June 10, that number is down to two or three passes. More

(Source: The Space Reporter - Jun 2)