<P> At middle latitudes , far from both the Equator and the poles , variations in the length of daytime are moderate . In the higher middle latitudes where Montreal , Paris and Ushuaia are located , the difference in the length of the day from summer to winter can be very noticeable : the sky may still be lit at 10 pm in summer , but may be dark at 5 pm in winter . In the lower middle latitudes where Southern California , Egypt and South Africa are located , the seasonal difference is smaller , but still results in approximately 4 hours difference in daylight between the winter and summer solstices . The difference becomes less pronounced the closer one gets to the equator . An approximation to the monthly change can be obtained from the rule of 12ths . With 4 hours change over the six months from winter to summer the day lengthens by about 4 * 1 / 12 of an hour ( 20 mins ) in the first month , 4 * 2 / 12 ( 40 mins ) in the second month , 4 * 3 / 12 ( 1 hr ) in the third month , then 1 hr , 40 mins and 20 mins in the fourth , fifth and six months . </P>
<P> At middle latitudes , far from both the Equator and the poles , variations in the length of daytime are moderate . In the higher middle latitudes where Montreal , Paris and Ushuaia are located , the difference in the length of the day from summer to winter can be very noticeable : the sky may still be lit at 10 pm in summer , but may be dark at 5 pm in winter . In the lower middle latitudes where Southern California , Egypt and South Africa are located , the seasonal difference is smaller , but still results in approximately 4 hours difference in daylight between the winter and summer solstices . The difference becomes less pronounced the closer one gets to the equator . An approximation to the monthly change can be obtained from the rule of 12ths . With 4 hours change over the six months from winter to summer the day lengthens by about 4 * 1 / 12 of an hour ( 20 mins ) in the first month , 4 * 2 / 12 ( 40 mins ) in the second month , 4 * 3 / 12 ( 1 hr ) in the third month , then 1 hr , 40 mins and 20 mins in the fourth , fifth and six months . </P>
4 . which latitudes experience the greatest annual change in daylight hours
4 . which latitudes experience the greatest annual change in daylight hours
higher middle latitudes
higher middle latitudes