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When I look out my window at night at the end of June, the sky is never completely dark, and it's lighter towards the North and East. I am at 56 degrees North.
I believe we get this for 2 months or so from May to July.
I know that further South in the UK experiences this also, and Edmonton, Canada too.
Would I be right in saying that the contiguous 48 states in America don't experience this?
Edinburgh has constant Nautical Twilight during the summer.
Here in Leeds the sky never goes completely dark in summer, like it does in winter, we have constant Astronomical twilight, so do London, Paris, Berlin and Amsterdam.
Nowhere in the lower 48 of the US experiences constant twilight in summer, Seattle comes close but not quite.
Here in Vancouver at 49°N we get constant astronomical twilight for about 2 weeks around the summer solstice. I imagine places on the Canada US border just south of us get it for a bit less than that but probably get it for several days at least.
For constant twilight of any kind during the summer, you need to be at least 48.561 degrees north, so a small area of Minnesota north of the 49th Parallel will get some constant Astronomical twilight during the summer
How far north does one have to go before this becomes really noticeable? Though there were late nights I don't remember it being light all night in southern England, but I do remember it being so in Northern Scotland. Are there gradations of this?
It's strange.. I lived in Winchester in Southern England for one summer and I really noticed the perhaps one hour less of daylight compared with Edinburgh.
When I was in the London area last Christmas, the only thing I noticed was that the sun was up for about 7 hours each day, then it got dark. But it was bright enough to be daylight, though, when the sun was up. It just never really rose up beyond the 2nd story house roofs. Keep in mind that the northernmost city in the Lower 48 states is Blaine, WA and that is about as far north as Paris. As far as latitude goes, the U.S. is pretty much from Paris to halfway down Western Sahara
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