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Las Vegas has above average daylight from April to September with May to July over 14 hours. December and January are the months with the least (10 hours or less). Peak daylight hours occur in June at 14 hours and 37 minutes. December’s low is 9 hours and 42 minutes. U.S. Daylight Savings (not including Hawaii and Arizona except for the Navajo reservation) starts the second Sunday of March and clocks turn back an hour the first Sunday of November. If visiting from overseas, our daylight savings changeovers may differ from yours. Civil dawn and civil dusk (both are civil twilight) is that time when the sun is 6 or fewer degrees (depression angle below horizon) away from rising or after setting. There is enough non-direct light for you to see okay but not great if outdoors. You should expect roughly 25-29 minutes in Las Vegas for each civil twilight. If you are visiting from some overseas areas such as Hong Kong or Japan, this may be a bit more civil twilight by a minute or so. However, if you are visiting from London or Moscow, you may be used to a civil twilight about 9 to 13 minutes longer than in Las Vegas.
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