At this latitude the midnight sun lasts from about May 20th to July 22nd, and civil polar twilight from about December 1st to January 11th.
At noon on the summer and winter solstices, the altitude of the sun is 44.45° and -1.52° respectively.
If the latitude in northern hemisphere is 69°48′ or smaller, every day in September can view both nautical dawn and dusk.
Also, if the latitude in northern hemisphere is 69°10′ or smaller, every day in April can view both civil dawn and dusk.
Starting at the Prime Meridian and heading eastwards, the parallel 69° north passes through: